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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1346votes
(Updated 23 April) Ready to talk biomes and dimensions? Here's how. Pinned
11877votes
Volcano Biome
1767votes
(May/June 2018) Featured Topic: Underground!
1055votes
Natural Disasters
1150votes
Dimension: The Abyss
410votes
City Biomes
568votes
Dinosaur Dimension
336votes
Put the far lands back in the game.
757votes
Deep Nether
445votes
Swamp Overhaul! (Pictures and Textures Included)
1184votes
Waterfall Biomes
361votes
(July 2018) Featured Topic: The Swamp
392votes
(Java Parity) Nether should use the full 256 world height.
227votes
New dimension: moon
255votes
Ice Caves
576votes
(Biome) Dead Forests
400votes
Improvements to Rivers
8votes
The upside down (A third dimesion)
238votes
Aether dimension
140votes
Actualizacion 1.18: La gran actualizacion
343votes
Nether Biome: Obsidian Shores
470votes
luminescent forest
152votes
Minecraft Dungeons Biome in Minecraft!
107votes
Deeper Underground
158votes
Candy dimension (was: New dimension)
6votes
Anti-Matter/Void Ghost Dimension
346votes
Realistic Biome generation
626votes
Better Snowfall
154votes
1.19 The End Update