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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829votes
(Updated 23 April) Ready to talk biomes and dimensions? Here's how. Pinned
1665votes
(May/June 2018) Featured Topic: Underground!
722votes
Natural Disasters
774votes
Dimension: The Abyss
272votes
City Biomes
314votes
(July 2018) Featured Topic: The Swamp
299votes
Swamp Overhaul! (Pictures and Textures Included)
640votes
Deep Nether
382votes
Dinosaur Dimension
206votes
Put the far lands back in the game.
677votes
Waterfall Biomes
134votes
(Java Parity) Nether should use the full 256 world height.
81votes
Deeper Underground
104votes
Candy dimension (was: New dimension)
245votes
Nether Biome: Obsidian Shores
243votes
Frostland Dimension (was: New Dimension: Frostland)
143votes
Brimstone Caves(Nether Update)
57votes
Sand Layer Desert Biome
375votes
(Biome) Dead Forests
188votes
Improvements to Rivers
229votes
Realistic Biome generation
98votes
New Nether Biome: Hadean Springs
70votes
(April Fools 2020 Content) Random Dimension Generator
172votes
Roofed Forest Overhaul!
288votes
luminescent forest
4votes
Great ocean
208votes
New biome: withered island
88votes
nether springs 1.16
255votes
(Nether Biome) Magma swamp