Please read the pinned post on creating biomes and dimensions. Please put items for the new Mountains and Nether Updates in their proper categories. Remember portals are structures, that includes Nether portals.

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11votes
Dried Up Ocean
11votes
(Biome) Nether Roof Biome
11votes
Ender jungle
11votes
Lakebed biome
11votes
New Hot Biome: "Tropical Wetlands"
11votes
Mooshroom Realm
11votes
Glowing forest biome
11votes
Great river biome
11votes
(Bedrock Parity) Villages in Flat Dimensions
11votes
Dragon Biome
11votes
fjord
11votes
The Mycosphere - a challenging new Underground biome
11votes
Salt Flats
11votes
Ice Age Dimension
11votes
the peacock forest ( a biome)
11votes
future dimension
11votes
Radioactive Plains (was: Underground Biomes)
11votes
The Mythos Dimension – Above Ground World Generation
11votes
Pumkin Field
11votes
The Wizard Of Oz
10votes
Final Edge biome
10votes
Fantasy Dimension for the Future: Ascendance
10votes
Obsidian Spikes(nether biome)
10votes
The Wither Caverns
10votes
Fantasy demention
10votes
Add more fictional biomes (like mooshroom fields)
10votes
Arctic Biome
10votes
Every End Gateway should lead to a different End biome.
10votes
Overhaul to Swamp Biome
10votes
Missing biomes: Basalt column biomes