{
  "type": "minecraft:flat_cache",
  "argument": {
    "type": "minecraft:clamp",
    "input": {
      "type": "minecraft:add",
      "argument1": -65,
      "argument2": {
        "type": "minecraft:mul",
        "argument1": 4.5,
        "argument2": {
          "type": "minecraft:noise",
          "noise": "tectonic:underground_river/y_offset",
          "xz_scale": 0.6,
          "y_scale": 0
        }
      }
    },
    "min": -68.5,
    "max": -60
  }
}