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Not to be confused with Basalt Deltas.
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Basalt Deltas

Consists of
Can generate in
existing chunks


Deltas are one-block-deep sheets of constrained lava found among the terrain of basalt deltas biomes. These lava terraces have just enough magma blocks that they don't entirely look like the lava sections of treasure room bastion remnants, of which they can be close by. Tending to be narrower than wide, they sometimes allow passage amongst their lava.

Often diagonal more than straight, they are more visible dangers than lava and magma blocks within basalt piles. Being relatively smooth in elevation, they also do not conceal drops within. They are as likely to be adjacent to such piles of ("eruptive") basalt as to flatter, "cooled lava flows" of basalt and blackstone.

Data values[]


NameNamespaced ID
[No displayed name]delta_feature


Java Edition
1.1620w15aAdded deltas.
1.1720w45aDue to a bug,[1] deltas no longer generate.
20w46aDeltas now generate again in the nether.
Bedrock Edition
1.16.0beta deltas.


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