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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1298votes
(Updated 23 April) Ready to talk biomes and dimensions? Here's how. Pinned
11671votes
Volcano Biome
1764votes
(May/June 2018) Featured Topic: Underground!
1136votes
Waterfall Biomes
1113votes
Dimension: The Abyss
1022votes
Natural Disasters
747votes
Deep Nether
611votes
Better Snowfall
563votes
(Biome) Dead Forests
556votes
Dinosaur Dimension
455votes
luminescent forest
436votes
Swamp Overhaul! (Pictures and Textures Included)
403votes
City Biomes
389votes
Improvements to Rivers
376votes
(Java Parity) Nether should use the full 256 world height.
360votes
(July 2018) Featured Topic: The Swamp
349votes
(Nether Biome) Magma swamp
340votes
Realistic Biome generation
336votes
Nether Biome: Obsidian Shores
327votes
Put the far lands back in the game.
290votes
New biome: withered island
247votes
Ice Caves
222votes
End Forest and End Core
218votes
Roofed Forest Overhaul!
213votes
Tropical islands
207votes
New dimension: moon
195votes
Lavender Oasis (End update)
182votes
Brimstone Caves(Nether Update)
179votes
The Spirit World