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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1260votes
(Updated 23 April) Ready to talk biomes and dimensions? Here's how. Pinned
11438votes
Volcano Biome
1760votes
(May/June 2018) Featured Topic: Underground!
4558votes
(Dimension) Sky lands under review
5593votes
Oasis under review
1971votes
Add natural events to the Nether. under review
4267votes
New Biome Called Cherry Blossom Grove under review
1130votes
Dream Biome! under review
998votes
Natural Disasters
2334votes
Biome: Magic Forest under review
1265votes
Make it rain in savanna biomes so that we can bless the rains down in Africa! under review
2680votes
Sandstorms under review
2122votes
Giants Biome under review
1082votes
Dimension: The Abyss
3572votes
A Mangrove forest announced
2146votes
(Swamp) Fog under review
398votes
City Biomes
550votes
Dinosaur Dimension
314votes
Put the far lands back in the game.
428votes
Swamp Overhaul! (Pictures and Textures Included)
733votes
Deep Nether
358votes
(July 2018) Featured Topic: The Swamp
1089votes
Waterfall Biomes
355votes
(Java Parity) Nether should use the full 256 world height.
8votes
The upside down (A third dimesion)
187votes
New dimension: moon
545votes
(Biome) Dead Forests
222votes
Ice Caves
365votes
Improvements to Rivers