"To the right of the player is a Taiga (mostly over the ocean), to the left is either a Forest, or Woods, I can’t remember. In the distance is probably tundra." -Notch
The biomes graph from Notch.
The graph above recreated.
According to Wikipedia, Biomes are climatically and geographically defined as similar climatic conditions on the Earth, such as communities of plants, animals, and soil organisms, and are often referred to as ecosystems.
In Minecraft, from the Halloween Update onwards, this means different areas with different heights, temperatures, humidity ratings and foliage colors are created.
Before the Halloween update, when a map was generated it got a theme of either Snowy or Grassy. After this update, a single world includes all themes in a logical fashion determined by the biomes graph.
A demonstration can be viewed here.
Pre-Update Saves
Worlds generated before the update will not be changed, but the grass color will be altered. However, any new chunks generated (by the player moving outside of the current world's bounds) will generate biomes, just as The Nether will be generated when you first enter it.
Biome Types
A .png from the minecraft files that determines the color of the grass at certain temperatures and rainfalls.
A border between two grass-based biomes. To the right, the grass is more dull/brown; to the left, it is greener.
You can tell biomes apart by the differentiating colors of grass and leaves, as well as what kind of blocks are in the area, i.e. cacti in desert, etc. There are 11 Biome types: (Note: these names come from Notch's notes)
| Biome | Characteristics | Image |
|---|---|---|
| Rain Forest | A biome with many trees and lakes. Some trees may also have leaves extending to the ground, covering the entire trunk. Has a 33% chance to create branched trees, compared to the usual 10%. Has, on average, five more trees per chunk than woods. |
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| Swamp | A biome with many small pools. Reeds are commonly found. |
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| Seasonal Forest | Has, on average, two more trees per chunk than woods. |
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| Forest | A biome with many trees. Has, on average, five more trees per chunk than woods. |
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| Savanna | A biome with mostly flat terrain, almost no trees, and dull colored grass. |
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| Woods | A biome with many trees. Has, on average, twenty trees per chunk. | |
| Taiga | A snowy biome composed of mostly mountainous terrian and, on average, twenty trees per chunk. |
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| Desert | A biome consisting mostly of sand and cacti. Has, on average, twenty less trees per chunk than woods. Trees do not generate in deserts unless the player brings in dirt, as dirt does not generate naturally in deserts. |
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| Plains | Just like desert, only with grass in the place of sand. has, on average, twenty less trees per chunk than woods. The occasional tree does exist, though very rarely. |
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| Tundra | Snowy, barren terrain with very few trees. Has, on average, twenty less trees per chunk than woods. The occasional tree does exist, though very rarely. |
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| The Nether | This is not an official biome, as it is not usually found in the normal world, but it does have unique geographical features, making it similar to a biome. In rare occasions, most likely due to glitches, nether biomes can be found in the normal world. |
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Biome Screen-shots
These screenshots were made by editing code in Minecraft's java files, creating worlds made up of only one Biome. This was done consecutively with each Biome type and their screen-shots are collated here. The original topic is on the Minecraft forum is here.
Remaining Work
Remaining work on biomes include variable elevations in certain biomes (flat elevation in desert biomes, etc.) in addition to improving the border between arctic and tropical biomes.
Also, snow currently does not "fall", meaning that once snow or ice has melted or been mined, it will not regenerate.









