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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966votes
(Updated 23 April) Ready to talk biomes and dimensions? Here's how. Pinned
1720votes
(May/June 2018) Featured Topic: Underground!
889votes
Dimension: The Abyss
834votes
Natural Disasters
805votes
Waterfall Biomes
678votes
Deep Nether
521votes
Better Snowfall
450votes
Dinosaur Dimension
445votes
(Biome) Dead Forests
339votes
luminescent forest
336votes
(July 2018) Featured Topic: The Swamp
333votes
Swamp Overhaul! (Pictures and Textures Included)
318votes
City Biomes
284votes
(Nether Biome) Magma swamp
277votes
Frostland Dimension (was: New Dimension: Frostland)
273votes
Nether Biome: Obsidian Shores
270votes
Realistic Biome generation
245votes
Improvements to Rivers
243votes
New biome: withered island
242votes
Put the far lands back in the game.
192votes
(Java Parity) Nether should use the full 256 world height.
187votes
Roofed Forest Overhaul!
156votes
Brimstone Caves(Nether Update)
155votes
The Spirit World
137votes
Lavender Oasis (End update)
136votes
Tropical islands
133votes
New Mountain Range Biome with higher building block limit/new mobs
126votes
White sand beaches
123votes
The Pillowrock Caves - A Late-Game Cave Biome Inspired by Real World Geology.