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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639votes
Ready to talk biomes and dimensions? Here's how to do it! (Start Here) Pinned
6votes
New Shade biome
11votes
The Jungle Update: Jungle Terrain improvements
13votes
A More Realistic Desert
97votes
White sand beaches
34votes
A biome called the Arachnid Forrest, a place filled with spiders.
34votes
30votes
(Nether Update) Withering Vents Biome!
15votes
New Biome: The Gloam Cavity! [Nether Update]
3votes
Green Netherwart Forest
10votes
Rocky coast biome
13votes
New Hot Biome: "Tropical Wetlands"
2votes
Disfigured portals.
5votes
Steppe
556votes
Dimension: The Abyss
4votes
Dead Under Water Biome
25votes
(Java Parity) Nether should use the full 256 world height.
27votes
Better lakes and rivers
17votes
Dark Jungle biomes
42votes
Brimstone Caves(Nether Update)
16votes
Dried Up Ocean
16votes
The Forgotten Biome (Contains Dinosaurs)
534votes
Natural Disasters
287votes
Dinosaur Dimension
10votes
End weather
14votes
Nether Vegitation
13votes
Make the new Nether Trees grow from the Ceiling as well.
17votes
The Fair Forest
17votes
Soul River Biome