[
  {
    "type": "mapgen",
    "om_terrain": [ "lake_bed" ],
    "weight": { "global_val": "vanilla_lake_weight", "default": 1000 },
    "object": { "fill_ter": "t_lake_bed", "furniture": { " ": [ [ "f_region_lake_bed", 1 ], [ "f_null", 199 ] ] } }
  }
]
