{
  "format_version": "1.21.60",
  "minecraft:client_biome": {
    "description": {
      "identifier": "swampland_mutated"
    },
    "components": {
      "minecraft:foliage_appearance": {
        "color": {
          "color_map": "swamp_foliage"
        }
      },
      "minecraft:grass_appearance": {
        "color": {
          "color_map": "swamp_grass"
        }
      }
    }
  }
}