Minecraft Wiki
For the level in Minecraft Dungeons, see MCD:Basalt Deltas.

The basalt deltas is a volcanic biome found in the Nether.


The basalt deltas is composed largely of basalt and blackstone. Its fog appears in a dull lilac color with ash particles passing by. Archipelagos with islands of different sizes can be found around the lava seas nearby.

Nether fortresses and caves filled with nether quartz ore can also be found here. Ore generates more commonly (to compensate for less netherrack to generate in). Bastion remnants do not generate here.

Basalt deltas are exceedingly dangerous due to their jagged terrain, countless deltas, ghasts and magma cubes. Magma cubes jump from above and are immune to damage from lava. Due to their high spawn rate, they can pose a threat to the player even while wearing netherite armor, but they also make the biome the best place from which to obtain magma cream. Being bumped here is more dangerous than in other biomes, as cliffs and hidden lava pools are common.

In Java Edition
MobSpawn weightGroup size
Monster category
Ghast[note 1]401401
Magma Cube1001402–5
Creature category
  1. Only 5% of spawn attempts succeed.
In Bedrock Edition
MobSpawn weightGroup size
Monster category
Magma Cube1001402–5
Creature category



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These music tracks play while the player is in the Basalt Deltas.

in Minecraft
Gameplay Soundtrack Title Soundtrack Track preview Weight
nether1.ogg The Nether "Concrete Halls" Minecraft - Volume Beta No. 7 1
nether2.ogg The Nether "Dead Voxel" Minecraft - Volume Beta No. 3 1
nether3.ogg The Nether "Warmth" Minecraft - Volume Beta No. 11 1
nether4.ogg The Nether "Ballad of the Cats" Minecraft - Volume Beta No. 15 1
so_below.ogg Soul Sand Valley and Basalt Deltas "So Below" Minecraft: Nether Update (Original Game Soundtrack) No. 3 File:So below.ogg 7


Nether ambience plays while the player is in the Nether.

Name Sound Group
Basalt Deltas Ambience Loop
Basalt deltas active 1 Loop Additions
Basalt deltas active 2
Basalt deltas active 3
Basalt deltas active 4
Basalt Deltas Basalt Ground 1
Basalt Deltas Basalt Ground 2
Basalt Deltas Basalt Ground 3
Basalt Deltas Basalt Ground 4
Basalt Deltas Click 1
Basalt Deltas Click 2
Basalt Deltas Click 3
Basalt Deltas Click 4
Basalt Deltas Click 5
Basalt Deltas Click 6
Basalt Deltas Click 7
Basalt Deltas Click 8
Basalt Deltas Debris 1
Basalt Deltas Debris 2
Basalt Deltas Debris 3
Basalt Deltas Heavy Click 1
Basalt Deltas Heavy Click 2
Basalt Deltas Long Debris 1
Basalt Deltas Long Debris 2
Basalt Deltas Plode 1
Basalt Deltas Plode 2
Basalt Deltas Plode 3
Basalt Deltas Twist 1
Basalt Deltas Twist 2
Basalt Deltas Twist 3
Basalt Deltas Twist 4

Data values[]


Java Edition:

NameIdentifierNumeric ID Translation key
Basalt Deltasbasalt_deltas173biome.minecraft.basalt_deltas

Bedrock Edition:

NameIdentifierNumeric ID
[No displayed name]basalt_deltas181


Java Edition
1.1620w15aAdded the basalt deltas.
20w16aIncreased the number of lava lakes on basalt deltas.
20w21aAncient debris and Nether Gold Ore can now generate.
1.1821w41aThe water fog color of basalt deltas changes from
, though in vanilla nether there's no water.
Bedrock Edition
1.16.0beta basalt deltas.
1.16.100beta ceiling of basalt deltas is now made out of basalt, instead of netherrack.


Issues relating to "Basalt Deltas" are maintained on the bug tracker. Report issues there.


  • Basalt Deltas biomes never share their border with Crimson Forest biomes.
  • Basalt Deltas are notable for having the constant, faint sound of a Geiger counter clicking. This is possibly due to the fact that radon gas, which is spewed from volcanoes during eruption, is a highly radioactive element. Given the basalt deltas' volcanic nature with ash particles floating around, one can assume the clicks are meant to imply the biome is a radioactive wasteland.


External Links[]