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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718votes
Ready to talk biomes and dimensions? Here's how to do it! (Start Here) Pinned
1vote
Nether Biomes (Mutated versions)
4votes
Moist Caverns
4votes
Dimension: sheep dimension
17votes
Lavender Oasis (End update)
6votes
[Scarred Plains] Specific Features
17votes
Scarred Plains
3votes
Color Dungeon
2votes
Vlčí dimenze
10votes
(Nether Update) A violet nether forest biome
9votes
Snowy birch forest
9votes
Charred Highlands (New Nether Biome)
11votes
Nether Biome:Ghast Geyser Biome
5votes
The Crystalized Nether
2votes
Vertical Cubic Expansion
1vote
Ginkgo nut trees biome
7votes
Green Fire/ the nether's core biome
15votes
(Nether Biome, New mob, new potion) The Crying Sea
2votes
mirror world
8votes
Ender Swamp
2votes
The Cat dimension and the dog dimension
12votes
(New Dimension) The Beginning - Water Dimension (Or another name)
1vote
A new biome titled Rainbow Mystery
1vote
Blocklings
3votes
Slipped Forest
24votes
Ash Geyser Biome
6votes
Quartzited Forest
41votes
Collided Forest
11votes
Weeping Forest