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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1283votes
(Updated 23 April) Ready to talk biomes and dimensions? Here's how. Pinned
11542votes
Volcano Biome
1762votes
(May/June 2018) Featured Topic: Underground!
1009votes
Natural Disasters
1100votes
Dimension: The Abyss
400votes
City Biomes
553votes
Dinosaur Dimension
319votes
Put the far lands back in the game.
429votes
Swamp Overhaul! (Pictures and Textures Included)
739votes
Deep Nether
359votes
(July 2018) Featured Topic: The Swamp
1116votes
Waterfall Biomes
362votes
(Java Parity) Nether should use the full 256 world height.
235votes
Ice Caves
197votes
New dimension: moon
552votes
(Biome) Dead Forests
8votes
The upside down (A third dimesion)
376votes
Improvements to Rivers
331votes
Nether Biome: Obsidian Shores
442votes
luminescent forest
105votes
Deeper Underground
334votes
Realistic Biome generation
6votes
Anti-Matter/Void Ghost Dimension
118votes
Actualizacion 1.18: La gran actualizacion
152votes
Candy dimension (was: New dimension)
179votes
Brimstone Caves(Nether Update)
134votes
Minecraft Dungeons Biome in Minecraft!
153votes
The Jungle Update: Jungle Terrain improvements
215votes
Roofed Forest Overhaul!