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
2votes
White Desert Biome
1vote
Abandoned Lab
1vote
The permaforest (part 1)
1vote
(Nether Update): The Burning Hollows Biome
1vote
The Magma Messa (for the Nether!!!)
25votes
(April Fools 2020 Content) Random Dimension Generator
2votes
Lost Vaults Dimension
1vote
Gypsum Desert (desert variant)
5votes
The Crystalized Nether
1vote
The flipside
12votes
Snowy birch forest
5votes
Charred Desert (New Nether Biome)
12votes
Nether Biome:Ghast Geyser Biome
12votes
(Nether Update) A violet nether forest biome
56votes
Flooded Forest: Something That The Overworld Needs
4votes
The Ashlands: the Nether’s equivalent of a tundra
18votes
Yellow Netherwart Forest
1vote
Nether Biomes (Mutated versions)
8votes
Nether update: obsidian valley
193votes
Frostland Dimension (was: New Dimension: Frostland)
241votes
Swamp Overhaul! (Pictures and Textures Included)
4votes
Moist Caverns
25votes
Ether Dimension
86votes
Tropical islands
18votes
Scarred Plains
0votes
Portal hecho con la obsidiana llorona
22votes
Dark Jungle biomes
50votes
(Plains Biome) Decrease the amount of waterholes