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Basalt Deltas

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The Basalt deltas is a volcanic biome situated in the Nether. It is the most dangerous biome here.


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).

Because the terrain in the biome is so mountainous, it can be pretty hard to build in. Bastion remnants do not generate here.

The Basalt deltas is also the most dangerous biome in the Nether due to the jagged terrain, countless deltas, ghasts and most dangerously: magma cubes. These jump from above and are amphibious (in lava). Due to their high-spawn rate, they can pose a big threat to the player even if wearing netherite armor but they also make the biome the best place to obtain magma cream. Being bumped here is more-dangerous than average. Their jumping movement however requires more space than the player.

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



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

in Minecraft
Gameplay Soundtrack Title Soundtrack Track preview
So Below Soul sand valleys and basalt deltas "So Below"


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[edit]


Java Edition:

NameNamespaced IDNumeric ID Translation key
Basalt Deltasbasalt_deltas 173biome.minecraft.basalt_deltas

Bedrock Edition:

NameNamespaced IDNumeric ID
[No displayed name]basalt_deltas 181


Java Edition
1.1620w15aAdded the basalt deltas.
20w16aIncreased the amount of lava lakes on basalt deltas.
20w19aPatches of blackstone and gravel now generate in basalt deltas at level of the lava ocean.
20w21aAncient debris and Nether Gold Ore can now generate.
Bedrock Edition
1.16.0beta basalt deltas.


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