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
1496votes
(May/June 2018) Featured Topic: Underground!
556votes
Dimension: The Abyss
534votes
Natural Disasters
424votes
Waterfall Biomes
287votes
Dinosaur Dimension
285votes
(July 2018) Featured Topic: The Swamp
247votes
(Biome) Dead Forests
216votes
luminescent forest
202votes
City Biomes
187votes
Swamp Overhaul! (Pictures and Textures Included)
179votes
Better Snowfall
175votes
Updating the Nether (new biomes, new mobs, new plants, treasures)
164votes
Frostland Dimension (was: New Dimension: Frostland)
160votes
Burnwood Trees That Could Generate in the Nether
157votes
Realistic Biome generation
139votes
Roofed Forest Overhaul!
135votes
Put the far lands back in the game.
132votes
The Spirit World
114votes
Improvements to Rivers
97votes
White sand beaches
76votes
The Pillowrock Caves - A Late-Game Cave Biome Inspired by Real World Geology.
74votes
Tropical islands
74votes
Curse of the Werewolf!
72votes
Sky islands
71votes
Wasteland Biome
71votes
New Mountain Range Biome with higher building block limit/new mobs
67votes
Candy dimension (was: New dimension)
67votes
Atlantis