[
  {
    "type": "overmap_special",
    "id": "iso_start_map",
    "overmaps": [
      { "point": [ 0, 0, -1 ], "overmap": "iso_first_elevator_north" },
      { "point": [ 0, -1, -1 ], "overmap": "iso_hallway_isolated_north" },
      { "point": [ 0, -2, -1 ], "overmap": "iso_next_level_elevator_south" }
    ],
    "locations": [ "iso_nether" ],
    "flags": [ "ISO_MAP", "GLOBALLY_UNIQUE" ],
    "city_distance": [ 0, 30 ],
    "city_sizes": [ 0, 16 ],
    "occurrences": [ 4, 4 ]
  }
]
