diff --git a/src/pocketmine/Server.php b/src/pocketmine/Server.php
index 438d92973..790631cc5 100644
--- a/src/pocketmine/Server.php
+++ b/src/pocketmine/Server.php
@@ -54,11 +54,12 @@ use pocketmine\level\format\anvil\Anvil;
 use pocketmine\level\format\leveldb\LevelDB;
 use pocketmine\level\format\LevelProviderManager;
 use pocketmine\level\format\mcregion\McRegion;
+use pocketmine\level\generator\biome\Biome;
 use pocketmine\level\generator\Flat;
 use pocketmine\level\generator\GenerationInstanceManager;
 use pocketmine\level\generator\GenerationRequestManager;
 use pocketmine\level\generator\Generator;
-use pocketmine\level\generator\Normal;
+use pocketmine\level\generator\normal\Normal;
 use pocketmine\level\Level;
 use pocketmine\metadata\EntityMetadataStore;
 use pocketmine\metadata\LevelMetadataStore;
@@ -1127,7 +1128,7 @@ class Server{
 	 *
 	 * @param string $name
 	 * @param int    $seed
-	 * @param string $generator Class name that extends pocketmine\level\generator\Generator
+	 * @param string $generator Class name that extends pocketmine\level\generator\Noise
 	 * @param array  $options
 	 *
 	 * @return bool
@@ -1609,6 +1610,7 @@ class Server{
 		InventoryType::init();
 		Block::init();
 		Item::init();
+		Biome::init();
 		/** TODO: @deprecated */
 		TextWrapper::init();
 		$this->craftingManager = new CraftingManager();
diff --git a/src/pocketmine/level/Level.php b/src/pocketmine/level/Level.php
index c0e9ea29a..9f9e79f76 100644
--- a/src/pocketmine/level/Level.php
+++ b/src/pocketmine/level/Level.php
@@ -2160,7 +2160,7 @@ class Level implements ChunkManager, Metadatable{
 	 * @return bool|Position
 	 */
 	public function getSafeSpawn($spawn = null){
-		if(!($spawn instanceof Vector3)){
+		if(!($spawn instanceof Vector3) or $spawn->y <= 0){
 			$spawn = $this->getSpawnLocation();
 		}
 		if($spawn instanceof Vector3){
diff --git a/src/pocketmine/level/generator/GenerationChunkManager.php b/src/pocketmine/level/generator/GenerationChunkManager.php
index e9c1d3c0a..3e5063a92 100644
--- a/src/pocketmine/level/generator/GenerationChunkManager.php
+++ b/src/pocketmine/level/generator/GenerationChunkManager.php
@@ -46,7 +46,7 @@ class GenerationChunkManager implements ChunkManager{
 
 	public function __construct(GenerationManager $manager, $levelID, $seed, $class, array $options){
 		if(!class_exists($class, true) or !is_subclass_of($class, Generator::class)){
-			throw new \InvalidStateException("Class $class does not exists or is not a subclass of Generator");
+			throw new \InvalidStateException("Class $class does not exists or is not a subclass of Noise");
 		}
 
 		$this->levelID = $levelID;
diff --git a/src/pocketmine/level/generator/GenerationLevelManager.php b/src/pocketmine/level/generator/GenerationLevelManager.php
index bdb5f6271..c7e8cb249 100644
--- a/src/pocketmine/level/generator/GenerationLevelManager.php
+++ b/src/pocketmine/level/generator/GenerationLevelManager.php
@@ -41,6 +41,10 @@ class GenerationLevelManager extends GenerationManager{
 
 	protected $maxCount;
 
+	protected $splitCount;
+
+	protected $count;
+
 	/**
 	 * @param Server                    $server
 	 * @param GenerationInstanceManager $manager
@@ -49,6 +53,15 @@ class GenerationLevelManager extends GenerationManager{
 		$this->server = $server;
 		$this->manager = $manager;
 		$this->maxCount = $this->server->getProperty("chunk-generation.per-tick", 1);
+
+		if($this->maxCount < 1){
+			$this->splitCount = $this->maxCount;
+			$this->maxCount = 1;
+		}else{
+			$this->splitCount = 1;
+		}
+
+		$this->count = 0;
 	}
 
 	public function openLevel($levelID, $seed, $class, array $options){
@@ -74,6 +87,15 @@ class GenerationLevelManager extends GenerationManager{
 
 	public function process(){
 		if(count($this->requestQueue) > 0){
+			if($this->splitCount < 1){
+				$this->count += $this->splitCount;
+				if($this->count < 1){
+					return;
+				}else{
+					$this->count = 0;
+				}
+			}
+
 			$count = 0;
 			foreach($this->requestQueue as $levelID => $chunks){
 				if($count >= $this->maxCount){
diff --git a/src/pocketmine/level/generator/GenerationManager.php b/src/pocketmine/level/generator/GenerationManager.php
index 0c0bd9feb..d25402a13 100644
--- a/src/pocketmine/level/generator/GenerationManager.php
+++ b/src/pocketmine/level/generator/GenerationManager.php
@@ -63,7 +63,7 @@ class GenerationManager{
 	 * byte[] payload:
 	 * int32 levelID
 	 * int32 seed
-	 * string class that extends pocketmine\level\generator\Generator
+	 * string class that extends pocketmine\level\generator\Noise
 	 * byte[] serialized options array
 	 */
 	const PACKET_OPEN_LEVEL = 0x02;
@@ -128,7 +128,7 @@ class GenerationManager{
 					$this->readPacket();
 				}
 			}catch(\Exception $e){
-				$this->logger->warning("[Generator Thread] Exception: " . $e->getMessage() . " on file \"" . $e->getFile() . "\" line " . $e->getLine());
+				$this->logger->warning("[Noise Thread] Exception: " . $e->getMessage() . " on file \"" . $e->getFile() . "\" line " . $e->getLine());
 			}
 		}
 	}
diff --git a/src/pocketmine/level/generator/Generator.php b/src/pocketmine/level/generator/Generator.php
index d151782c4..8e8a07ebd 100644
--- a/src/pocketmine/level/generator/Generator.php
+++ b/src/pocketmine/level/generator/Generator.php
@@ -20,10 +20,12 @@
 */
 
 /**
- * Generator classes used in Levels
+ * Noise classes used in Levels
  */
 namespace pocketmine\level\generator;
 
+use pocketmine\level\generator\noise\Noise;
+use pocketmine\level\generator\normal\Normal;
 use pocketmine\utils\Random;
 
 abstract class Generator{
@@ -57,6 +59,159 @@ abstract class Generator{
 		return "unknown";
 	}
 
+	/**
+	 * @param Noise $noise
+	 * @param int   $xSize
+	 * @param int   $samplingRate
+	 * @param int   $x
+	 * @param int   $y
+	 * @param int   $z
+	 *
+	 * @return \SplFixedArray
+	 */
+	public static function getFastNoise1D(Noise $noise, $xSize, $samplingRate, $x, $y, $z){
+		if($samplingRate === 0){
+			throw new \InvalidArgumentException("samplingRate cannot be 0");
+		}
+		if ($xSize % $samplingRate !== 0) {
+			throw new \InvalidArgumentCountException("xSize % samplingRate must return 0");
+		}
+
+		$noiseArray = new \SplFixedArray($xSize + 1);
+
+		for($xx = 0; $xx <= $xSize; $xx += $samplingRate){
+			$noiseArray[$xx] = $noise->noise3D($xx + $x, $y, $z);
+		}
+
+		for($xx = 0; $xx < $xSize; ++$xx){
+			if($xx % $samplingRate !== 0){
+				$nx = (int) ($xx / $samplingRate) * $samplingRate;
+				$noiseArray[$xx] = Noise::linearLerp($xx, $nx, $nx + $samplingRate, $noiseArray[$nx], $noiseArray[$nx + $samplingRate]);
+			}
+		}
+
+		return $noiseArray;
+	}
+
+	/**
+	 * @param Noise $noise
+	 * @param int   $xSize
+	 * @param int   $zSize
+	 * @param int   $samplingRate
+	 * @param int   $x
+	 * @param int   $y
+	 * @param int   $z
+	 *
+	 * @return \SplFixedArray
+	 */
+	public static function getFastNoise2D(Noise $noise, $xSize, $zSize, $samplingRate, $x, $y, $z){
+		if($samplingRate === 0){
+			throw new \InvalidArgumentException("samplingRate cannot be 0");
+		}
+		if ($xSize % $samplingRate !== 0) {
+			throw new \InvalidArgumentCountException("xSize % samplingRate must return 0");
+		}
+		if ($zSize % $samplingRate !== 0) {
+			throw new \InvalidArgumentCountException("zSize % samplingRate must return 0");
+		}
+
+		$noiseArray = new \SplFixedArray($xSize + 1);
+
+		for($xx = 0; $xx <= $xSize; $xx += $samplingRate){
+			$noiseArray[$xx] = new \SplFixedArray($zSize + 1);
+			for($zz = 0; $zz <= $zSize; $zz += $samplingRate){
+				$noiseArray[$xx][$zz] = $noise->noise3D($x + $xx, $y, $z + $zz);
+			}
+		}
+
+		for($xx = 0; $xx < $xSize; ++$xx){
+			if($xx % $samplingRate !== 0){
+				$noiseArray[$xx] = new \SplFixedArray($zSize + 1);
+			}
+
+			for($zz = 0; $zz < $zSize; ++$zz){
+				if($xx % $samplingRate !== 0 or $zz % $samplingRate !== 0){
+					$nx = (int) ($xx / $samplingRate) * $samplingRate;
+					$nz = (int) ($zz / $samplingRate) * $samplingRate;
+					$noiseArray[$xx][$zz] = Noise::bilinearLerp(
+						$xx, $zz, $noiseArray[$nx][$nz], $noiseArray[$nx][$nz + $samplingRate],
+						$noiseArray[$nx + $samplingRate][$nz], $noiseArray[$nx + $samplingRate][$nz + $samplingRate],
+						$nx, $nx + $samplingRate, $nz, $nz + $samplingRate
+					);
+				}
+			}
+		}
+
+		return $noiseArray;
+	}
+
+	/**
+	 * @param Noise $noise
+	 * @param int   $xSize
+	 * @param int   $ySize
+	 * @param int   $zSize
+	 * @param int   $xSamplingRate
+	 * @param int   $ySamplingRate
+	 * @param int   $zSamplingRate
+	 * @param int   $x
+	 * @param int   $y
+	 * @param int   $z
+	 *
+	 * @return \SplFixedArray
+	 */
+	public static function getFastNoise3D(Noise $noise, $xSize, $ySize, $zSize, $xSamplingRate, $ySamplingRate, $zSamplingRate, $x, $y, $z){
+		if($xSamplingRate === 0){
+			throw new \InvalidArgumentException("xSamplingRate cannot be 0");
+		}
+		if($zSamplingRate === 0){
+			throw new \InvalidArgumentException("zSamplingRate cannot be 0");
+		}
+		if($ySamplingRate === 0){
+			throw new \InvalidArgumentException("ySamplingRate cannot be 0");
+		}
+		if ($xSize % $xSamplingRate !== 0) {
+			throw new \InvalidArgumentCountException("xSize % xSamplingRate must return 0");
+		}
+		if ($zSize % $zSamplingRate !== 0) {
+			throw new \InvalidArgumentCountException("zSize % zSamplingRate must return 0");
+		}
+		if ($ySize % $ySamplingRate !== 0) {
+			throw new \InvalidArgumentCountException("ySize % ySamplingRate must return 0");
+		}
+
+		$noiseArray = array_fill(0, $xSize + 1, array_fill(0, $zSize + 1, []));
+
+		for($xx = 0; $xx <= $xSize; $xx += $xSamplingRate){
+			for($zz = 0; $zz <= $zSize; $zz += $zSamplingRate){
+				for($yy = 0; $yy <= $ySize; $yy += $ySamplingRate){
+					$noiseArray[$xx][$zz][$yy] = $noise->noise3D($x + $xx, $y + $yy, $z + $zz);
+				}
+			}
+		}
+
+		for($xx = 0; $xx < $xSize; ++$xx){
+			for($zz = 0; $zz < $zSize; ++$zz){
+				for($yy = 0; $yy < $ySize; ++$yy){
+					if($xx % $xSamplingRate !== 0 or $zz % $zSamplingRate !== 0 or $yy % $ySamplingRate !== 0){
+						$nx = (int) ($xx / $xSamplingRate) * $xSamplingRate;
+						$nz = (int) ($zz / $zSamplingRate) * $zSamplingRate;
+						$ny = (int) ($yy / $ySamplingRate) * $ySamplingRate;
+						$noiseArray[$xx][$zz][$yy] = Noise::trilinearLerp(
+							$xx, $yy, $zz, $noiseArray[$nx][$nz][$ny], $noiseArray[$nx][$nz][$nny = $ny + $ySamplingRate],
+							$noiseArray[$nx][$nnz = $nz + $zSamplingRate][$ny], $noiseArray[$nx][$nnz][$nny],
+							$noiseArray[$nnx = $nx + $xSamplingRate][$nz][$ny], $noiseArray[$nnx][$nz][$nny],
+							$noiseArray[$nnx][$nnz][$ny],
+							$noiseArray[$nnx][$nnz][$nny],
+							$nx, $nnx, $ny, $nny, $nz, $nnz
+						);
+					}
+				}
+			}
+		}
+
+		return $noiseArray;
+	}
+
 	public abstract function __construct(array $settings = []);
 
 	public abstract function init(GenerationChunkManager $level, Random $random);
diff --git a/src/pocketmine/level/generator/biome/Biome.php b/src/pocketmine/level/generator/biome/Biome.php
new file mode 100644
index 000000000..a29b35b65
--- /dev/null
+++ b/src/pocketmine/level/generator/biome/Biome.php
@@ -0,0 +1,123 @@
+<?php
+
+/*
+ *
+ *  ____            _        _   __  __ _                  __  __ ____
+ * |  _ \ ___   ___| | _____| |_|  \/  (_)_ __   ___      |  \/  |  _ \
+ * | |_) / _ \ / __| |/ / _ \ __| |\/| | | '_ \ / _ \_____| |\/| | |_) |
+ * |  __/ (_) | (__|   <  __/ |_| |  | | | | | |  __/_____| |  | |  __/
+ * |_|   \___/ \___|_|\_\___|\__|_|  |_|_|_| |_|\___|     |_|  |_|_|
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * @author PocketMine Team
+ * @link http://www.pocketmine.net/
+ *
+ *
+*/
+
+namespace pocketmine\level\generator\biome;
+
+use pocketmine\level\ChunkManager;
+use pocketmine\level\generator\normal\biome\BeachBiome;
+use pocketmine\level\generator\normal\biome\DesertBiome;
+use pocketmine\level\generator\normal\biome\ForestBiome;
+use pocketmine\level\generator\normal\biome\MountainsBiome;
+use pocketmine\level\generator\normal\biome\OceanBiome;
+use pocketmine\level\generator\normal\biome\PlainBiome;
+use pocketmine\level\generator\normal\biome\RiverBiome;
+use pocketmine\level\generator\normal\biome\SmallMountainsBiome;
+use pocketmine\level\generator\populator\Populator;
+use pocketmine\utils\Random;
+
+abstract class Biome{
+
+	const OCEAN = 0;
+	const PLAINS = 1;
+	const DESERT = 2;
+	const MOUNTAINS = 3;
+	const FOREST = 4;
+
+	const RIVER = 7;
+
+	const BEACH = 16;
+
+	const SMALL_MOUNTAINS = 20;
+
+
+	const MAX_BIOMES = 256;
+
+	/** @var Biome[] */
+	private static $biomes = [];
+	private static $setup = false;
+
+	private $id;
+	private $registered = false;
+	/** @var Populator[] */
+	private $populators = [];
+
+	protected static function register($id, Biome $biome){
+		self::$biomes[(int) $id] = $biome;
+		$biome->setId((int) $id);
+	}
+
+	public static function init(){
+		if(self::$setup === false){
+			self::$setup = true;
+			self::register(self::OCEAN, new OceanBiome());
+			self::register(self::PLAINS, new PlainBiome());
+			self::register(self::DESERT, new DesertBiome());
+			self::register(self::MOUNTAINS, new MountainsBiome());
+			self::register(self::FOREST, new ForestBiome());
+
+			self::register(self::RIVER, new RiverBiome());
+
+			self::register(self::BEACH, new BeachBiome());
+
+			self::register(self::SMALL_MOUNTAINS, new SmallMountainsBiome());
+		}
+	}
+
+	/**
+	 * @param $id
+	 *
+	 * @return Biome
+	 */
+	public static function getBiome($id){
+		return isset(self::$biomes[$id]) ? self::$biomes[$id] : null;
+	}
+
+	public function clearPopulators(){
+		$this->populators = [];
+	}
+
+	public function addPopulator(Populator $populator){
+		$this->populators[] = $populator;
+	}
+
+	public function populateChunk(ChunkManager $level, $chunkX, $chunkZ, Random $random){
+		foreach($this->populators as $populator){
+			$populator->populate($level, $chunkX, $chunkZ, $random);
+		}
+	}
+
+	public function getPopulators(){
+		return $this->populators;
+	}
+
+	public function setId($id){
+		if(!$this->registered){
+			$this->registered = true;
+			$this->id = $id;
+		}
+	}
+
+	public function getId(){
+		return $this->id;
+	}
+
+	public abstract function getName();
+}
\ No newline at end of file
diff --git a/src/pocketmine/level/generator/biome/BiomeSelector.php b/src/pocketmine/level/generator/biome/BiomeSelector.php
new file mode 100644
index 000000000..70ce44fd6
--- /dev/null
+++ b/src/pocketmine/level/generator/biome/BiomeSelector.php
@@ -0,0 +1,78 @@
+<?php
+
+/*
+ *
+ *  ____            _        _   __  __ _                  __  __ ____
+ * |  _ \ ___   ___| | _____| |_|  \/  (_)_ __   ___      |  \/  |  _ \
+ * | |_) / _ \ / __| |/ / _ \ __| |\/| | | '_ \ / _ \_____| |\/| | |_) |
+ * |  __/ (_) | (__|   <  __/ |_| |  | | | | | |  __/_____| |  | |  __/
+ * |_|   \___/ \___|_|\_\___|\__|_|  |_|_|_| |_|\___|     |_|  |_|_|
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * @author PocketMine Team
+ * @link http://www.pocketmine.net/
+ *
+ *
+*/
+
+namespace pocketmine\level\generator\biome;
+
+use pocketmine\level\generator\noise\Simplex;
+use pocketmine\utils\Random;
+
+class BiomeSelector{
+
+	/** @var Biome */
+	private $fallback;
+
+	/** @var Simplex */
+	private $temperature;
+	/** @var Simplex */
+	private $rainfall;
+
+	/** @var Biome[] */
+	private $biomes = [];
+
+	private $select = [];
+
+	public function __construct(Random $random, Biome $fallback){
+		$this->fallback = $fallback;
+		$this->temperature = new Simplex($random, 1, 0.004, 0.5, 2);
+		$this->rainfall = new Simplex($random, 1, 0.004, 0.5, 2);
+	}
+
+	public function addBiome(Biome $biome, $start, $end){
+		$this->biomes[$biome->getId()] = $biome;
+		$this->select[$biome->getId()] = [$biome->getId(), $start, $end];
+	}
+
+	/**
+	 * @param $x
+	 * @param $z
+	 *
+	 * @return Biome
+	 */
+	public function pickBiome($x, $z){
+		//$temperature = $this->temperature->noise2D($x, $z);
+		$rainfall = $this->rainfall->noise2D($x, $z);
+
+		if($rainfall > 0.9){
+			return Biome::getBiome(Biome::OCEAN);
+		}elseif($rainfall > 0.7){
+			return Biome::getBiome(Biome::RIVER);
+		}elseif($rainfall > 0.6){
+			return Biome::getBiome(Biome::BEACH);
+		}elseif($rainfall > 0.2){
+			return Biome::getBiome(Biome::PLAINS);
+		}elseif($rainfall > -0.3){
+			return Biome::getBiome(Biome::FOREST);
+		}else{
+			return Biome::getBiome(Biome::DESERT);
+		}
+
+	}
+}
\ No newline at end of file
diff --git a/src/pocketmine/level/generator/noise/Generator.php b/src/pocketmine/level/generator/noise/Noise.php
similarity index 62%
rename from src/pocketmine/level/generator/noise/Generator.php
rename to src/pocketmine/level/generator/noise/Noise.php
index 47c848bc5..2c5a36483 100644
--- a/src/pocketmine/level/generator/noise/Generator.php
+++ b/src/pocketmine/level/generator/noise/Noise.php
@@ -28,13 +28,14 @@
 namespace pocketmine\level\generator\noise;
 
 
-abstract class Generator{
+abstract class Noise{
 	protected $perm = [];
 	protected $offsetX = 0;
 	protected $offsetY = 0;
 	protected $offsetZ = 0;
 	protected $octaves = 8;
 	protected $frequency;
+	protected $lacunarity;
 	protected $amplitude;
 
 	public static function floor($x){
@@ -49,6 +50,42 @@ abstract class Generator{
 		return $y + $x * ($z - $y);
 	}
 
+	public static function linearLerp($x, $x1, $x2, $q0, $q1){
+		return (($x2 - $x) / ($x2 - $x1)) * $q0 + (($x - $x1) / ($x2 - $x1)) * $q1;
+	}
+
+	public static function bilinearLerp($x, $y, $q00, $q01, $q10, $q11, $x1, $x2, $y1, $y2){
+		$dx1 = (($x2 - $x) / ($x2 - $x1));
+		$dx2 = (($x - $x1) / ($x2 - $x1));
+
+		return (($y2 - $y) / ($y2 - $y1)) * (
+			$dx1 * $q00 + $dx2 * $q10
+		) + (($y - $y1) / ($y2 - $y1)) * (
+			$dx1 * $q01 + $dx2 * $q11
+		);
+	}
+
+	public static function trilinearLerp($x, $y, $z, $q000, $q001, $q010, $q011, $q100, $q101, $q110, $q111, $x1, $x2, $y1, $y2, $z1, $z2) {
+		$dx1 = (($x2 - $x) / ($x2 - $x1));
+		$dx2 = (($x - $x1) / ($x2 - $x1));
+		$dy1 = (($y2 - $y) / ($y2 - $y1));
+		$dy2 = (($y - $y1) / ($y2 - $y1));
+
+		return (($z2 - $z) / ($z2 - $z1)) * (
+			$dy1 * (
+				$dx1 * $q000 + $dx2 * $q100
+			) + $dy2 * (
+				$dx1 * $q001 + $dx2 * $q101
+			)
+		) + (($z - $z1) / ($z2 - $z1)) * (
+			$dy1 * (
+				$dx1 * $q010 + $dx2 * $q110
+			) + $dy2 * (
+				$dx1 * $q011 + $dx2 * $q111
+			)
+		);
+	}
+
 	public static function grad($hash, $x, $y, $z){
 		$hash &= 15;
 		$u = $hash < 8 ? $x : $y;
@@ -64,13 +101,16 @@ abstract class Generator{
 	public function noise2D($x, $z, $normalized = false){
 		$result = 0;
 		$amp = 1;
-		$freq = 1;
+		$laq = 1;
 		$max = 0;
 
+		$x *= $this->frequency;
+		$z *= $this->frequency;
+
 		for($i = 0; $i < $this->octaves; ++$i){
-			$result += $this->getNoise2D($x * $freq, $z * $freq) * $amp;
+			$result += $this->getNoise2D($x * $laq, $z * $laq) * $amp;
 			$max += $amp;
-			$freq *= $this->frequency;
+			$laq *= $this->lacunarity;
 			$amp *= $this->amplitude;
 		}
 		if($normalized === true){
@@ -83,13 +123,17 @@ abstract class Generator{
 	public function noise3D($x, $y, $z, $normalized = false){
 		$result = 0;
 		$amp = 1;
-		$freq = 1;
+		$laq = 1;
 		$max = 0;
 
+		$x *= $this->frequency;
+		$y *= $this->frequency;
+		$z *= $this->frequency;
+
 		for($i = 0; $i < $this->octaves; ++$i){
-			$result += $this->getNoise3D($x * $freq, $y * $freq, $z * $freq) * $amp;
+			$result += $this->getNoise3D($x * $laq, $y * $laq, $z * $laq) * $amp;
 			$max += $amp;
-			$freq *= $this->frequency;
+			$laq *= $this->lacunarity;
 			$amp *= $this->amplitude;
 		}
 		if($normalized === true){
diff --git a/src/pocketmine/level/generator/noise/Perlin.php b/src/pocketmine/level/generator/noise/Perlin.php
index 1b7c653e7..034953f2b 100644
--- a/src/pocketmine/level/generator/noise/Perlin.php
+++ b/src/pocketmine/level/generator/noise/Perlin.php
@@ -23,7 +23,7 @@ namespace pocketmine\level\generator\noise;
 
 use pocketmine\utils\Random;
 
-class Perlin extends Generator{
+class Perlin extends Noise{
 	public static $grad3 = [
 		[1, 1, 0], [-1, 1, 0], [1, -1, 0], [-1, -1, 0],
 		[1, 0, 1], [-1, 0, 1], [1, 0, -1], [-1, 0, -1],
@@ -31,9 +31,10 @@ class Perlin extends Generator{
 	];
 
 
-	public function __construct(Random $random, $octaves, $frequency, $amplitude){
+	public function __construct(Random $random, $octaves, $frequency, $amplitude, $lacunarity){
 		$this->octaves = $octaves;
 		$this->frequency = $frequency;
+		$this->lacunarity = $lacunarity;
 		$this->amplitude = $amplitude;
 		$this->offsetX = $random->nextFloat() * 256;
 		$this->offsetY = $random->nextFloat() * 256;
diff --git a/src/pocketmine/level/generator/noise/Simplex.php b/src/pocketmine/level/generator/noise/Simplex.php
index 8cda255c8..421137490 100644
--- a/src/pocketmine/level/generator/noise/Simplex.php
+++ b/src/pocketmine/level/generator/noise/Simplex.php
@@ -63,8 +63,8 @@ class Simplex extends Perlin{
 	protected $offsetW;
 
 
-	public function __construct(Random $random, $octaves, $frequency, $amplitude){
-		parent::__construct($random, $octaves, $frequency, $amplitude);
+	public function __construct(Random $random, $octaves, $frequency, $amplitude, $lacunarity){
+		parent::__construct($random, $octaves, $frequency, $amplitude, $lacunarity);
 		$this->offsetW = $random->nextFloat() * 256;
 		self::$SQRT_3 = sqrt(3);
 		self::$SQRT_5 = sqrt(5);
diff --git a/src/pocketmine/level/generator/Normal.php b/src/pocketmine/level/generator/normal/Normal.php
similarity index 55%
rename from src/pocketmine/level/generator/Normal.php
rename to src/pocketmine/level/generator/normal/Normal.php
index d48949203..6bd5ab793 100644
--- a/src/pocketmine/level/generator/Normal.php
+++ b/src/pocketmine/level/generator/normal/Normal.php
@@ -19,7 +19,7 @@
  *
 */
 
-namespace pocketmine\level\generator;
+namespace pocketmine\level\generator\normal;
 
 use pocketmine\block\Block;
 use pocketmine\block\CoalOre;
@@ -30,12 +30,19 @@ use pocketmine\block\Gravel;
 use pocketmine\block\IronOre;
 use pocketmine\block\LapisOre;
 use pocketmine\block\RedstoneOre;
+use pocketmine\level\generator\biome\Biome;
+use pocketmine\level\generator\biome\BiomeSelector;
+use pocketmine\level\generator\GenerationChunkManager;
+use pocketmine\level\generator\Generator;
+use pocketmine\level\generator\noise\Perlin;
 use pocketmine\level\generator\noise\Simplex;
+use pocketmine\level\generator\normal\biome\NormalBiome;
 use pocketmine\level\generator\object\OreType;
 use pocketmine\level\generator\populator\Ore;
 use pocketmine\level\generator\populator\Populator;
 use pocketmine\level\generator\populator\TallGrass;
 use pocketmine\level\generator\populator\Tree;
+use pocketmine\level\Level;
 use pocketmine\math\Vector3 as Vector3;
 use pocketmine\utils\Random;
 
@@ -47,15 +54,34 @@ class Normal extends Generator{
 	private $level;
 	/** @var Random */
 	private $random;
-	private $worldHeight = 65;
-	private $waterHeight = 63;
-	/** @var Simplex */
-	private $noiseHills;
+	private $waterHeight = 62;
+	private $bedrockDepth = 5;
 	/** @var Simplex */
 	private $noiseBase;
 
-	public function __construct(array $options = []){
+	/** @var BiomeSelector */
+	private $selector;
 
+	private static $GAUSSIAN_KERNEL = null;
+	private static $SMOOTH_SIZE = 2;
+
+	public function __construct(array $options = []){
+		if(self::$GAUSSIAN_KERNEL === null){
+			self::generateKernel();
+		}
+	}
+
+	private static function generateKernel(){
+		self::$GAUSSIAN_KERNEL = [];
+		$bellSize = 1 / self::$SMOOTH_SIZE;
+		$bellHeight = 2 * self::$SMOOTH_SIZE;
+		for($sx = -self::$SMOOTH_SIZE; $sx <= self::$SMOOTH_SIZE; ++$sx){
+			for($sz = -self::$SMOOTH_SIZE; $sz <= self::$SMOOTH_SIZE; ++$sz){
+				$bx = $bellSize * $sx;
+				$bz = $bellSize * $sz;
+				self::$GAUSSIAN_KERNEL[$sx + self::$SMOOTH_SIZE][$sz + self::$SMOOTH_SIZE] = $bellHeight * exp(-($bx * $bx + $bz * $bz) / 2);
+			}
+		}
 	}
 
 	public function getName(){
@@ -70,8 +96,9 @@ class Normal extends Generator{
 		$this->level = $level;
 		$this->random = $random;
 		$this->random->setSeed($this->level->getSeed());
-		$this->noiseHills = new Simplex($this->random, 3, 0.1, 12);
-		$this->noiseBase = new Simplex($this->random, 16, 0.6, 16);
+		$this->noiseBase = new Simplex($this->random, 16, 0.012, 0.5, 2);
+		$this->random->setSeed($this->level->getSeed());
+		$this->selector = new BiomeSelector($this->random, Biome::getBiome(Biome::OCEAN));
 
 
 		$ores = new Ore();
@@ -100,52 +127,63 @@ class Normal extends Generator{
 
 	public function generateChunk($chunkX, $chunkZ){
 		$this->random->setSeed(0xdeadbeef ^ ($chunkX << 8) ^ $chunkZ ^ $this->level->getSeed());
-		$hills = [];
-		$base = [];
-		for($z = 0; $z < 16; ++$z){
-			for($x = 0; $x < 16; ++$x){
-				$i = ($z << 4) + $x;
-				$hills[$i] = $this->noiseHills->noise2D($x + ($chunkX << 4), $z + ($chunkZ << 4), true);
-				$base[$i] = $this->noiseBase->noise2D($x + ($chunkX << 4), $z + ($chunkZ << 4), true);
+		//$hills = [];
+		//$base = [];
 
-				if($base[$i] < 0){
-					$base[$i] *= 0.5;
-				}
-			}
-		}
+		$start = microtime(true);
+
+		$noise = Generator::getFastNoise3D($this->noiseBase, 16, 128, 16, 8, 8, 8, $chunkX * 16, 0, $chunkZ * 16);
 
 		$chunk = $this->level->getChunk($chunkX, $chunkZ);
 
-		for($z = 0; $z < 16; ++$z){
-			for($x = 0; $x < 16; ++$x){
-				$i = ($z << 4) + $x;
-				$height = $this->worldHeight + $hills[$i] * 14 + $base[$i] * 7;
-				$height = (int) $height;
+		$biomeCache = [];
 
-				for($y = 0; $y < 128; ++$y){
-					$diff = $height - $y;
-					if($y <= 4 and ($y === 0 or $this->random->nextFloat() < 0.75)){
-						$chunk->setBlockId($x, $y, $z, Block::BEDROCK);
-					}elseif($diff > 2){
-						$chunk->setBlockId($x, $y, $z, Block::STONE);
-					}elseif($diff > 0){
-						$chunk->setBlockId($x, $y, $z, Block::DIRT);
-					}elseif($y <= $this->waterHeight){
-						if(($this->waterHeight - $y) <= 1 and $diff === 0){
-							$chunk->setBlockId($x, $y, $z, Block::SAND);
-						}elseif($diff === 0){
-							$chunk->setBlockId($x, $y, $z, Block::DIRT);
+		for($x = 0; $x < 16; ++$x){
+			for($z = 0; $z < 16; ++$z){
+				$minSum = 0;
+				$maxSum = 0;
+				$weightSum = 0;
+
+				for($sx = -self::$SMOOTH_SIZE; $sx <= self::$SMOOTH_SIZE; ++$sx){
+					for($sz = -self::$SMOOTH_SIZE; $sz <= self::$SMOOTH_SIZE; ++$sz){
+						if(isset($biomeCache[$index = (($chunkX * 16 + $x + $sx * 16) >> 2) . ":" . (($chunkZ * 16 + $z + $sz * 16) >> 2)])){
+							$adjacent = $biomeCache[$index];
 						}else{
-							$chunk->setBlockId($x, $y, $z, Block::STILL_WATER);
+							$adjacent = $this->selector->pickBiome($chunkX * 16 + $x + $sx * 16, $chunkZ * 16 + $z + $sz * 16);
+							$biomeCache[$index] = $adjacent;
 						}
-					}elseif($diff === 0){
-						$chunk->setBlockId($x, $y, $z, Block::GRASS);
+						/** @var NormalBiome $adjacent */
+						$weight = self::$GAUSSIAN_KERNEL[$sx + self::$SMOOTH_SIZE][$sz + self::$SMOOTH_SIZE];
+						$minSum += $adjacent->getMinElevation() * $weight;
+						$maxSum += $adjacent->getMaxElevation() * $weight;
+						$weightSum += $weight;
 					}
 				}
 
+				$minElevation = $minSum / $weightSum;
+				$smoothHeight = ($maxSum / $weightSum - $minElevation) / 2;
+
+				for($y = 0; $y < 128; ++$y){
+					if($y === 0){
+						$chunk->setBlockId($x, $y, $z, Block::BEDROCK);
+						continue;
+					}
+					$noiseValue = $noise[$x][$z][$y] - 1 / $smoothHeight * ($y - $smoothHeight - $minElevation);
+
+					if($noiseValue >= 0){
+						$chunk->setBlockId($x, $y, $z, Block::STONE);
+					}else{
+						if($y <= $this->waterHeight){
+							$chunk->setBlockId($x, $y, $z, Block::STILL_WATER);
+						}
+						$chunk->setBlockSkyLight($x, $y, $z, 15);
+					}
+				}
 			}
 		}
 
+
+		var_dump((microtime(true) - $start) * 1000);
 	}
 
 	public function populateChunk($chunkX, $chunkZ){
diff --git a/src/pocketmine/level/generator/normal/biome/BeachBiome.php b/src/pocketmine/level/generator/normal/biome/BeachBiome.php
new file mode 100644
index 000000000..2c67883da
--- /dev/null
+++ b/src/pocketmine/level/generator/normal/biome/BeachBiome.php
@@ -0,0 +1,35 @@
+<?php
+
+/*
+ *
+ *  ____            _        _   __  __ _                  __  __ ____
+ * |  _ \ ___   ___| | _____| |_|  \/  (_)_ __   ___      |  \/  |  _ \
+ * | |_) / _ \ / __| |/ / _ \ __| |\/| | | '_ \ / _ \_____| |\/| | |_) |
+ * |  __/ (_) | (__|   <  __/ |_| |  | | | | | |  __/_____| |  | |  __/
+ * |_|   \___/ \___|_|\_\___|\__|_|  |_|_|_| |_|\___|     |_|  |_|_|
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * @author PocketMine Team
+ * @link http://www.pocketmine.net/
+ *
+ *
+*/
+
+namespace pocketmine\level\generator\normal\biome;
+
+class BeachBiome extends GrassyBiome{
+
+	public function __construct(){
+		parent::__construct();
+
+		$this->setElevation(62, 65);
+	}
+
+	public function getName(){
+		return "Beach";
+	}
+}
\ No newline at end of file
diff --git a/src/pocketmine/level/generator/normal/biome/DesertBiome.php b/src/pocketmine/level/generator/normal/biome/DesertBiome.php
new file mode 100644
index 000000000..180db1fa7
--- /dev/null
+++ b/src/pocketmine/level/generator/normal/biome/DesertBiome.php
@@ -0,0 +1,35 @@
+<?php
+
+/*
+ *
+ *  ____            _        _   __  __ _                  __  __ ____
+ * |  _ \ ___   ___| | _____| |_|  \/  (_)_ __   ___      |  \/  |  _ \
+ * | |_) / _ \ / __| |/ / _ \ __| |\/| | | '_ \ / _ \_____| |\/| | |_) |
+ * |  __/ (_) | (__|   <  __/ |_| |  | | | | | |  __/_____| |  | |  __/
+ * |_|   \___/ \___|_|\_\___|\__|_|  |_|_|_| |_|\___|     |_|  |_|_|
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * @author PocketMine Team
+ * @link http://www.pocketmine.net/
+ *
+ *
+*/
+
+namespace pocketmine\level\generator\normal\biome;
+
+class DesertBiome extends GrassyBiome{
+
+	public function __construct(){
+		parent::__construct();
+
+		$this->setElevation(63, 74);
+	}
+
+	public function getName(){
+		return "Desert";
+	}
+}
\ No newline at end of file
diff --git a/src/pocketmine/level/generator/normal/biome/ForestBiome.php b/src/pocketmine/level/generator/normal/biome/ForestBiome.php
new file mode 100644
index 000000000..be18d7498
--- /dev/null
+++ b/src/pocketmine/level/generator/normal/biome/ForestBiome.php
@@ -0,0 +1,47 @@
+<?php
+
+/*
+ *
+ *  ____            _        _   __  __ _                  __  __ ____
+ * |  _ \ ___   ___| | _____| |_|  \/  (_)_ __   ___      |  \/  |  _ \
+ * | |_) / _ \ / __| |/ / _ \ __| |\/| | | '_ \ / _ \_____| |\/| | |_) |
+ * |  __/ (_) | (__|   <  __/ |_| |  | | | | | |  __/_____| |  | |  __/
+ * |_|   \___/ \___|_|\_\___|\__|_|  |_|_|_| |_|\___|     |_|  |_|_|
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * @author PocketMine Team
+ * @link http://www.pocketmine.net/
+ *
+ *
+*/
+
+namespace pocketmine\level\generator\normal\biome;
+
+use pocketmine\level\generator\populator\TallGrass;
+use pocketmine\level\generator\populator\Tree;
+
+class ForestBiome extends GrassyBiome{
+
+	public function __construct(){
+		parent::__construct();
+
+		$trees = new Tree();
+		$trees->setBaseAmount(5);
+		$this->addPopulator($trees);
+
+		$tallGrass = new TallGrass();
+		$tallGrass->setBaseAmount(3);
+
+		$this->addPopulator($tallGrass);
+
+		$this->setElevation(63, 81);
+	}
+
+	public function getName(){
+		return "Forest";
+	}
+}
\ No newline at end of file
diff --git a/src/pocketmine/level/generator/normal/biome/GrassyBiome.php b/src/pocketmine/level/generator/normal/biome/GrassyBiome.php
new file mode 100644
index 000000000..6431cd8a0
--- /dev/null
+++ b/src/pocketmine/level/generator/normal/biome/GrassyBiome.php
@@ -0,0 +1,37 @@
+<?php
+
+/*
+ *
+ *  ____            _        _   __  __ _                  __  __ ____
+ * |  _ \ ___   ___| | _____| |_|  \/  (_)_ __   ___      |  \/  |  _ \
+ * | |_) / _ \ / __| |/ / _ \ __| |\/| | | '_ \ / _ \_____| |\/| | |_) |
+ * |  __/ (_) | (__|   <  __/ |_| |  | | | | | |  __/_____| |  | |  __/
+ * |_|   \___/ \___|_|\_\___|\__|_|  |_|_|_| |_|\___|     |_|  |_|_|
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * @author PocketMine Team
+ * @link http://www.pocketmine.net/
+ *
+ *
+*/
+
+namespace pocketmine\level\generator\normal\biome;
+
+use pocketmine\block\Block;
+
+abstract class GrassyBiome extends NormalBiome{
+
+	public function __construct(){
+		$this->setGroundCover([
+			Block::get(Block::GRASS, 0),
+			Block::get(Block::DIRT, 0),
+			Block::get(Block::DIRT, 0),
+			Block::get(Block::DIRT, 0),
+			Block::get(Block::DIRT, 0),
+		]);
+	}
+}
\ No newline at end of file
diff --git a/src/pocketmine/level/generator/normal/biome/MountainsBiome.php b/src/pocketmine/level/generator/normal/biome/MountainsBiome.php
new file mode 100644
index 000000000..f0854ab1f
--- /dev/null
+++ b/src/pocketmine/level/generator/normal/biome/MountainsBiome.php
@@ -0,0 +1,49 @@
+<?php
+
+/*
+ *
+ *  ____            _        _   __  __ _                  __  __ ____
+ * |  _ \ ___   ___| | _____| |_|  \/  (_)_ __   ___      |  \/  |  _ \
+ * | |_) / _ \ / __| |/ / _ \ __| |\/| | | '_ \ / _ \_____| |\/| | |_) |
+ * |  __/ (_) | (__|   <  __/ |_| |  | | | | | |  __/_____| |  | |  __/
+ * |_|   \___/ \___|_|\_\___|\__|_|  |_|_|_| |_|\___|     |_|  |_|_|
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * @author PocketMine Team
+ * @link http://www.pocketmine.net/
+ *
+ *
+*/
+
+namespace pocketmine\level\generator\normal\biome;
+
+use pocketmine\level\generator\populator\TallGrass;
+use pocketmine\level\generator\populator\Tree;
+
+class MountainsBiome extends GrassyBiome{
+
+	public function __construct(){
+		parent::__construct();
+
+		$trees = new Tree();
+		$trees->setBaseAmount(1);
+		$this->addPopulator($trees);
+
+		$tallGrass = new TallGrass();
+		$tallGrass->setBaseAmount(1);
+
+		$this->addPopulator($tallGrass);
+
+		//TODO: add emerald
+
+		$this->setElevation(63, 127);
+	}
+
+	public function getName(){
+		return "Mountains";
+	}
+}
\ No newline at end of file
diff --git a/src/pocketmine/level/generator/normal/biome/NormalBiome.php b/src/pocketmine/level/generator/normal/biome/NormalBiome.php
new file mode 100644
index 000000000..581bc6795
--- /dev/null
+++ b/src/pocketmine/level/generator/normal/biome/NormalBiome.php
@@ -0,0 +1,53 @@
+<?php
+
+/*
+ *
+ *  ____            _        _   __  __ _                  __  __ ____
+ * |  _ \ ___   ___| | _____| |_|  \/  (_)_ __   ___      |  \/  |  _ \
+ * | |_) / _ \ / __| |/ / _ \ __| |\/| | | '_ \ / _ \_____| |\/| | |_) |
+ * |  __/ (_) | (__|   <  __/ |_| |  | | | | | |  __/_____| |  | |  __/
+ * |_|   \___/ \___|_|\_\___|\__|_|  |_|_|_| |_|\___|     |_|  |_|_|
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * @author PocketMine Team
+ * @link http://www.pocketmine.net/
+ *
+ *
+*/
+
+namespace pocketmine\level\generator\normal\biome;
+
+use pocketmine\level\generator\biome\Biome;
+
+abstract class NormalBiome extends Biome{
+
+	private $minElevation;
+	private $maxElevation;
+
+	private $groundCover = [];
+
+	public function getMinElevation(){
+		return $this->minElevation;
+	}
+
+	public function getMaxElevation(){
+		return $this->maxElevation;
+	}
+
+	public function setElevation($min, $max){
+		$this->minElevation = $min;
+		$this->maxElevation = $max;
+	}
+
+	public function getGroundCover(){
+		return $this->groundCover;
+	}
+
+	public function setGroundCover(array $covers){
+		$this->groundCover = $covers;
+	}
+}
diff --git a/src/pocketmine/level/generator/normal/biome/OceanBiome.php b/src/pocketmine/level/generator/normal/biome/OceanBiome.php
new file mode 100644
index 000000000..92bb99d2a
--- /dev/null
+++ b/src/pocketmine/level/generator/normal/biome/OceanBiome.php
@@ -0,0 +1,42 @@
+<?php
+
+/*
+ *
+ *  ____            _        _   __  __ _                  __  __ ____
+ * |  _ \ ___   ___| | _____| |_|  \/  (_)_ __   ___      |  \/  |  _ \
+ * | |_) / _ \ / __| |/ / _ \ __| |\/| | | '_ \ / _ \_____| |\/| | |_) |
+ * |  __/ (_) | (__|   <  __/ |_| |  | | | | | |  __/_____| |  | |  __/
+ * |_|   \___/ \___|_|\_\___|\__|_|  |_|_|_| |_|\___|     |_|  |_|_|
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * @author PocketMine Team
+ * @link http://www.pocketmine.net/
+ *
+ *
+*/
+
+namespace pocketmine\level\generator\normal\biome;
+
+use pocketmine\level\generator\populator\TallGrass;
+
+class OceanBiome extends GrassyBiome{
+
+	public function __construct(){
+		parent::__construct();
+
+		$tallGrass = new TallGrass();
+		$tallGrass->setBaseAmount(5);
+
+		$this->addPopulator($tallGrass);
+
+		$this->setElevation(46, 58);
+	}
+
+	public function getName(){
+		return "Ocean";
+	}
+}
\ No newline at end of file
diff --git a/src/pocketmine/level/generator/normal/biome/PlainBiome.php b/src/pocketmine/level/generator/normal/biome/PlainBiome.php
new file mode 100644
index 000000000..e48a6eee8
--- /dev/null
+++ b/src/pocketmine/level/generator/normal/biome/PlainBiome.php
@@ -0,0 +1,42 @@
+<?php
+
+/*
+ *
+ *  ____            _        _   __  __ _                  __  __ ____
+ * |  _ \ ___   ___| | _____| |_|  \/  (_)_ __   ___      |  \/  |  _ \
+ * | |_) / _ \ / __| |/ / _ \ __| |\/| | | '_ \ / _ \_____| |\/| | |_) |
+ * |  __/ (_) | (__|   <  __/ |_| |  | | | | | |  __/_____| |  | |  __/
+ * |_|   \___/ \___|_|\_\___|\__|_|  |_|_|_| |_|\___|     |_|  |_|_|
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * @author PocketMine Team
+ * @link http://www.pocketmine.net/
+ *
+ *
+*/
+
+namespace pocketmine\level\generator\normal\biome;
+
+use pocketmine\level\generator\populator\TallGrass;
+
+class PlainBiome extends GrassyBiome{
+
+	public function __construct(){
+		parent::__construct();
+
+		$tallGrass = new TallGrass();
+		$tallGrass->setBaseAmount(5);
+
+		$this->addPopulator($tallGrass);
+
+		$this->setElevation(63, 74);
+	}
+
+	public function getName(){
+		return "Plains";
+	}
+}
\ No newline at end of file
diff --git a/src/pocketmine/level/generator/normal/biome/RiverBiome.php b/src/pocketmine/level/generator/normal/biome/RiverBiome.php
new file mode 100644
index 000000000..fcedca423
--- /dev/null
+++ b/src/pocketmine/level/generator/normal/biome/RiverBiome.php
@@ -0,0 +1,42 @@
+<?php
+
+/*
+ *
+ *  ____            _        _   __  __ _                  __  __ ____
+ * |  _ \ ___   ___| | _____| |_|  \/  (_)_ __   ___      |  \/  |  _ \
+ * | |_) / _ \ / __| |/ / _ \ __| |\/| | | '_ \ / _ \_____| |\/| | |_) |
+ * |  __/ (_) | (__|   <  __/ |_| |  | | | | | |  __/_____| |  | |  __/
+ * |_|   \___/ \___|_|\_\___|\__|_|  |_|_|_| |_|\___|     |_|  |_|_|
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * @author PocketMine Team
+ * @link http://www.pocketmine.net/
+ *
+ *
+*/
+
+namespace pocketmine\level\generator\normal\biome;
+
+use pocketmine\level\generator\populator\TallGrass;
+
+class RiverBiome extends GrassyBiome{
+
+	public function __construct(){
+		parent::__construct();
+
+		$tallGrass = new TallGrass();
+		$tallGrass->setBaseAmount(5);
+
+		$this->addPopulator($tallGrass);
+
+		$this->setElevation(58, 62);
+	}
+
+	public function getName(){
+		return "River";
+	}
+}
\ No newline at end of file
diff --git a/src/pocketmine/level/generator/normal/biome/SandyBiome.php b/src/pocketmine/level/generator/normal/biome/SandyBiome.php
new file mode 100644
index 000000000..cb3b41021
--- /dev/null
+++ b/src/pocketmine/level/generator/normal/biome/SandyBiome.php
@@ -0,0 +1,36 @@
+<?php
+
+/*
+ *
+ *  ____            _        _   __  __ _                  __  __ ____
+ * |  _ \ ___   ___| | _____| |_|  \/  (_)_ __   ___      |  \/  |  _ \
+ * | |_) / _ \ / __| |/ / _ \ __| |\/| | | '_ \ / _ \_____| |\/| | |_) |
+ * |  __/ (_) | (__|   <  __/ |_| |  | | | | | |  __/_____| |  | |  __/
+ * |_|   \___/ \___|_|\_\___|\__|_|  |_|_|_| |_|\___|     |_|  |_|_|
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * @author PocketMine Team
+ * @link http://www.pocketmine.net/
+ *
+ *
+*/
+
+namespace pocketmine\level\generator\normal\biome;
+
+use pocketmine\block\Block;
+
+abstract class SandyBiome extends NormalBiome{
+
+	public function __construct(){
+		$this->setGroundCover([
+			Block::get(Block::SAND, 0),
+			Block::get(Block::SANDSTONE, 0),
+			Block::get(Block::SANDSTONE, 0),
+			Block::get(Block::SANDSTONE, 0),
+		]);
+	}
+}
\ No newline at end of file
diff --git a/src/pocketmine/level/generator/normal/biome/SmallMountainsBiome.php b/src/pocketmine/level/generator/normal/biome/SmallMountainsBiome.php
new file mode 100644
index 000000000..9321d19a4
--- /dev/null
+++ b/src/pocketmine/level/generator/normal/biome/SmallMountainsBiome.php
@@ -0,0 +1,38 @@
+<?php
+
+/*
+ *
+ *  ____            _        _   __  __ _                  __  __ ____
+ * |  _ \ ___   ___| | _____| |_|  \/  (_)_ __   ___      |  \/  |  _ \
+ * | |_) / _ \ / __| |/ / _ \ __| |\/| | | '_ \ / _ \_____| |\/| | |_) |
+ * |  __/ (_) | (__|   <  __/ |_| |  | | | | | |  __/_____| |  | |  __/
+ * |_|   \___/ \___|_|\_\___|\__|_|  |_|_|_| |_|\___|     |_|  |_|_|
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * @author PocketMine Team
+ * @link http://www.pocketmine.net/
+ *
+ *
+*/
+
+namespace pocketmine\level\generator\normal\biome;
+
+use pocketmine\level\generator\populator\TallGrass;
+use pocketmine\level\generator\populator\Tree;
+
+class SmallMountainsBiome extends MountainsBiome{
+
+	public function __construct(){
+		parent::__construct();
+
+		$this->setElevation(63, 97);
+	}
+
+	public function getName(){
+		return "Small Mountains";
+	}
+}
\ No newline at end of file
diff --git a/src/pocketmine/utils/Random.php b/src/pocketmine/utils/Random.php
index f47fb5c4e..fe2b0cf8c 100644
--- a/src/pocketmine/utils/Random.php
+++ b/src/pocketmine/utils/Random.php
@@ -23,7 +23,7 @@ namespace pocketmine\utils;
 
 
 /**
- * Unsecure Random Number Generator, used for fast seeded values
+ * Unsecure Random Number Noise, used for fast seeded values
  * WARNING: This class is available on the PocketMine-MP Zephir project.
  * If this class is modified, remember to modify the PHP C extension.
  */