Delta

Not to be confused with Basalt Deltas.

Delta

Biomes	Basalt Deltas
Generates in existing chunks	No
Consists of	Lava Magma Block Blackstone

A delta is a one-block-deep sheet of constrained lava found among the terrain of basalt deltas biome in the Nether.

Deltas are one-block-deep terraced lava lakes, often divided by lines of blackstone. Magma blocks also generate as part of these generated structures, replacing some of the lava. Deltas tend to be adjacent to or surrounded by basalt columns.

Java Edition:

Feature type	Identifier
[No displayed name]	delta_feature

Configured feature	Identifier
[No displayed name]	delta

Bedrock Edition:

Feature	Identifier
[No displayed name]	delta_feature

Java Edition:

The only rule for which blocks the delta feature can replace (via the 'contents' or 'rim' block state) is that the target block must have one air block above it and no horizontally-adjacent air blocks. One consequence of this is that delta features cannot generate underwater, but can generate on the water's surface if the feature placement is on the same y-level.

Delta features are always generated last regardless of the order specified by their biome's generation step. In effect, this means that delta blocks can be overridden by features such as tall grass, often resulting in a splotchy appearance.

{
  "type": "minecraft:delta_feature",
  "config": {
    "contents": {
      "Name": "minecraft:lava",
      "Properties": {
        "level": "0"
      }
    },
    "rim": {
      "Name": "minecraft:magma_block"
    },
    "rim_size": {
      "type": "minecraft:uniform",
      "value": {
        "max_inclusive": 2,
        "min_inclusive": 0
      }
    },
    "size": {
      "type": "minecraft:uniform",
      "value": {
        "max_inclusive": 7,
        "min_inclusive": 3
      }
    }
  }
}

Issues relating to "Delta" are maintained on the bug tracker. Issues should be reported and viewed there.

• 
  A large delta near the lava oceans.
• 
  Small delta next to the lava ocean.
• 
  Several stacked deltas.

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