Please read the pinned post on creating new biomes and dimensions. Remember that individual items, mobs, and structures should still go in their own categories - this is not a category for entire updates.

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1301votes
(Updated 23 April) Ready to talk biomes and dimensions? Here's how. Pinned
11682votes
Volcano Biome
1766votes
(May/June 2018) Featured Topic: Underground!
4926votes
(Dimension) Sky lands under review
6033votes
Oasis under review
4718votes
New Biome Called Cherry Blossom Grove under review
2068votes
Add natural events to the Nether. under review
2623votes
Biome: Magic Forest under review
1215votes
Dream Biome! under review
1022votes
Natural Disasters
2977votes
Sandstorms under review
1333votes
Make it rain in savanna biomes so that we can bless the rains down in Africa! under review
2215votes
Giants Biome under review
1115votes
Dimension: The Abyss
3703votes
A Mangrove forest announced
2345votes
(Swamp) Fog under review
404votes
City Biomes
556votes
Dinosaur Dimension
328votes
Put the far lands back in the game.
747votes
Deep Nether
436votes
Swamp Overhaul! (Pictures and Textures Included)
1140votes
Waterfall Biomes
360votes
(July 2018) Featured Topic: The Swamp
377votes
(Java Parity) Nether should use the full 256 world height.
248votes
Ice Caves
209votes
New dimension: moon
564votes
(Biome) Dead Forests
8votes
The upside down (A third dimesion)
389votes
Improvements to Rivers