{
  "_comment": "Biome set of the island. tools/biome_layout.py reads vanilla's overworld biome parameters, sends every vanilla biome to its target below, adds the extra entries and writes the world type. Adrian's list (2026-10-28): cherry grove, mangrove swamp, deep dark, jagged peaks, lush caves, dripstone caves, basalt deltas (as a cave biome; no Nether), jungle, desert, badlands, mountain edge, plains, forest. 'Mountain edge' no longer exists (removed in 1.18); windswept hills is its closest successor.",
  "allowed": [
    "minecraft:plains",
    "minecraft:forest",
    "minecraft:cherry_grove",
    "minecraft:mangrove_swamp",
    "minecraft:jungle",
    "minecraft:desert",
    "minecraft:badlands",
    "minecraft:windswept_hills",
    "minecraft:jagged_peaks",
    "minecraft:lush_caves",
    "minecraft:dripstone_caves",
    "minecraft:deep_dark",
    "minecraft:basalt_deltas"
  ],
  "water": [
    "minecraft:ocean",
    "minecraft:deep_ocean",
    "minecraft:lukewarm_ocean",
    "minecraft:deep_lukewarm_ocean",
    "minecraft:warm_ocean",
    "minecraft:river",
    "minecraft:beach"
  ],
  "remap": {
    "minecraft:plains": "minecraft:plains",
    "minecraft:sunflower_plains": "minecraft:plains",
    "minecraft:snowy_plains": "minecraft:plains",
    "minecraft:ice_spikes": "minecraft:plains",
    "minecraft:mushroom_fields": "minecraft:plains",
    "minecraft:forest": "minecraft:forest",
    "minecraft:flower_forest": "minecraft:forest",
    "minecraft:birch_forest": "minecraft:forest",
    "minecraft:old_growth_birch_forest": "minecraft:forest",
    "minecraft:dark_forest": "minecraft:forest",
    "minecraft:taiga": "minecraft:forest",
    "minecraft:snowy_taiga": "minecraft:forest",
    "minecraft:old_growth_pine_taiga": "minecraft:forest",
    "minecraft:old_growth_spruce_taiga": "minecraft:forest",
    "minecraft:windswept_forest": "minecraft:forest",
    "minecraft:grove": "minecraft:forest",
    "minecraft:meadow": "minecraft:cherry_grove",
    "minecraft:cherry_grove": "minecraft:cherry_grove",
    "minecraft:swamp": "minecraft:mangrove_swamp",
    "minecraft:mangrove_swamp": "minecraft:mangrove_swamp",
    "minecraft:jungle": "minecraft:jungle",
    "minecraft:sparse_jungle": "minecraft:jungle",
    "minecraft:bamboo_jungle": "minecraft:jungle",
    "minecraft:desert": "minecraft:desert",
    "minecraft:savanna": "minecraft:desert",
    "minecraft:savanna_plateau": "minecraft:badlands",
    "minecraft:windswept_savanna": "minecraft:badlands",
    "minecraft:badlands": "minecraft:badlands",
    "minecraft:eroded_badlands": "minecraft:badlands",
    "minecraft:wooded_badlands": "minecraft:badlands",
    "minecraft:windswept_hills": "minecraft:windswept_hills",
    "minecraft:windswept_gravelly_hills": "minecraft:windswept_hills",
    "minecraft:snowy_slopes": "minecraft:windswept_hills",
    "minecraft:stony_shore": "minecraft:windswept_hills",
    "minecraft:jagged_peaks": "minecraft:jagged_peaks",
    "minecraft:frozen_peaks": "minecraft:jagged_peaks",
    "minecraft:stony_peaks": "minecraft:jagged_peaks",
    "minecraft:river": "minecraft:river",
    "minecraft:frozen_river": "minecraft:river",
    "minecraft:beach": "minecraft:beach",
    "minecraft:snowy_beach": "minecraft:beach",
    "minecraft:ocean": "minecraft:ocean",
    "minecraft:cold_ocean": "minecraft:ocean",
    "minecraft:frozen_ocean": "minecraft:ocean",
    "minecraft:deep_ocean": "minecraft:deep_ocean",
    "minecraft:deep_cold_ocean": "minecraft:deep_ocean",
    "minecraft:deep_frozen_ocean": "minecraft:deep_ocean",
    "minecraft:lukewarm_ocean": "minecraft:lukewarm_ocean",
    "minecraft:deep_lukewarm_ocean": "minecraft:deep_lukewarm_ocean",
    "minecraft:warm_ocean": "minecraft:warm_ocean",
    "minecraft:lush_caves": "minecraft:lush_caves",
    "minecraft:dripstone_caves": "minecraft:dripstone_caves",
    "minecraft:deep_dark": "minecraft:deep_dark"
  },
  "split": [
    {
      "_comment": "Adrian (2026-10-30): the Deep Dark took the island's whole deepslate layer. Vanilla puts it at depth 1.1 wherever erosion is low, at any temperature. Now it is the Deep Dark only under cold and temperate land (vanilla's three cooler temperature bands); under the hottest land (desert and badlands climate) it becomes basalt deltas (the Basalt Furnace, a cave zone up to Lv 70); under warm land, ordinary caves of the land above.",
      "biome": "minecraft:deep_dark",
      "parameter": "temperature",
      "pieces": [
        {"range": [-1.0, -0.1], "to": "minecraft:deep_dark"},
        {"range": [0.4, 1.0], "to": "minecraft:basalt_deltas"}
      ]
    }
  ],
  "add": [
    {
      "_comment": "Volcanic caves under the hottest, driest land (where desert and badlands are), at cave depth like lush and dripstone caves.",
      "biome": "minecraft:basalt_deltas",
      "parameters": {
        "temperature": [0.55, 1.0],
        "humidity": [-1.0, -0.1],
        "continentalness": [-0.11, 1.0],
        "erosion": [-1.0, 1.0],
        "weirdness": [-1.0, 1.0],
        "depth": [0.2, 0.9],
        "offset": 0.0
      }
    }
  ]
}