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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614votes
Ready to talk biomes and dimensions? Here's how to do it! (Start Here) Pinned
1460votes
(May/June 2018) Featured Topic: Underground!
522votes
Dimension: The Abyss
497votes
Natural Disasters
385votes
Waterfall Biomes
276votes
(July 2018) Featured Topic: The Swamp
272votes
Dinosaur Dimension
231votes
(Biome) Dead Forests
205votes
luminescent forest
187votes
City Biomes
173votes
Swamp Overhaul! (Pictures and Textures Included)
166votes
Better Snowfall
156votes
Updating the Nether (new biomes, new mobs, new plants, treasures)
156votes
Burnwood Trees That Could Generate in the Nether
148votes
Frostland Dimension (was: New Dimension: Frostland)
144votes
Realistic Biome generation
131votes
Roofed Forest Overhaul!
128votes
The Spirit World
123votes
Put the far lands back in the game.
105votes
Improvements to Rivers
91votes
White sand beaches
69votes
The Pillowrock Caves - A Late-Game Cave Biome Inspired by Real World Geology.
68votes
Wasteland Biome
67votes
Tropical islands
67votes
Curse of the Werewolf!
67votes
Sky islands
63votes
Candy dimension (was: New dimension)
63votes
City biome (abandoned)
62votes
Atlantis