{
  "feature": "minecraft:kelp",
  "placement": [
    {
      "type": "minecraft:noise_based_count",
      "noise_factor": 80.0,
      "noise_to_count_ratio": 120
    },
    {
      "type": "minecraft:in_square"
    },
    {
      "type": "minecraft:heightmap",
      "heightmap": "OCEAN_FLOOR"
    },
    {
      "type": "minecraft:block_predicate_filter",
      "predicate": {
        "type": "minecraft:all_of",
        "predicates": [
          {
            "type": "minecraft:matching_blocks",
            "blocks": "minecraft:water"
          },
          {
            "type": "minecraft:matching_blocks",
            "blocks": "minecraft:water",
            "offset": [
              0,
              1,
              0
            ]
          },
          {
            "type": "minecraft:has_sturdy_face",
            "direction": "up",
            "offset": [
              0,
              -1,
              0
            ]
          },
          {
            "type": "minecraft:not",
            "predicate": {
              "type": "minecraft:matching_block_tag",
              "offset": [
                0,
                -1,
                0
              ],
              "tag": "minecraft:cannot_support_kelp"
            }
          }
        ]
      }
    },
    {
      "type": "minecraft:biome"
    }
  ]
}