Although the Nether biome is a hot topic, remember that items still should be put in their proper categories, even if they are Nether related. 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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716votes
Ready to talk biomes and dimensions? Here's how to do it! (Start Here) Pinned
1578votes
(May/June 2018) Featured Topic: Underground!
642votes
Dimension: The Abyss
586votes
Deep Nether
577votes
Natural Disasters
531votes
Waterfall Biomes
319votes
Dinosaur Dimension
296votes
(Biome) Dead Forests
290votes
(July 2018) Featured Topic: The Swamp
240votes
luminescent forest
236votes
Swamp Overhaul! (Pictures and Textures Included)
223votes
City Biomes
200votes
Better Snowfall
191votes
Frostland Dimension (was: New Dimension: Frostland)
184votes
Nether Biome: Obsidian Shores
184votes
Realistic Biome generation
178votes
(Nether Biome) Magma swamp
160votes
Put the far lands back in the game.
159votes
Roofed Forest Overhaul!
143votes
Improvements to Rivers
136votes
The Spirit World
128votes
More biomes in the Nether Update
121votes
Nether biome Magma Fields
102votes
White sand beaches
100votes
Brimstone Caves(Nether Update)
92votes
(Nether update) Thermal vents
91votes
The Pillowrock Caves - A Late-Game Cave Biome Inspired by Real World Geology.
85votes
Tropical islands
82votes
(Java Parity) Nether should use the full 256 world height.