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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720votes
Ready to talk biomes and dimensions? Here's how to do it! (Start Here) Pinned
23votes
(April Fools 2020 Content) Random Dimension Generator
1vote
Abandoned Lab
1vote
(Nether Update): The Burning Hollows Biome
1vote
The permaforest (part 1)
1vote
Gypsum Desert (desert variant)
1vote
The Magma Messa (for the Nether!!!)
5votes
Charred Desert (New Nether Biome)
2votes
White Desert Biome
4votes
The Ashlands: the Nether’s equivalent of a tundra
1vote
Nether Biomes (Mutated versions)
4votes
Moist Caverns
4votes
Dimension: sheep dimension
19votes
Lavender Oasis (End update)
7votes
[Scarred Plains] Specific Features
18votes
Scarred Plains
3votes
Color Dungeon
2votes
Vlčí dimenze
12votes
(Nether Update) A violet nether forest biome
12votes
Snowy birch forest
9votes
Charred Highlands (New Nether Biome)
12votes
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