MCMinecraft Assets Explorer

{
  "feature": "minecraft:underwater_magma",
  "placement": [
    {
      "type": "minecraft:count",
      "count": {
        "type": "minecraft:uniform",
        "max_inclusive": 52,
        "min_inclusive": 44
      }
    },
    {
      "type": "minecraft:in_square"
    },
    {
      "type": "minecraft:height_range",
      "height": {
        "type": "minecraft:uniform",
        "max_inclusive": {
          "absolute": 256
        },
        "min_inclusive": {
          "above_bottom": 0
        }
      }
    },
    {
      "type": "minecraft:surface_relative_threshold_filter",
      "heightmap": "OCEAN_FLOOR_WG",
      "max_inclusive": -2
    },
    {
      "type": "minecraft:biome"
    }
  ]
}