[
  {
    "type": "mapgen",
    "method": "json",
    "om_terrain": [ "lake_surface" ],
    "object": { "fill_ter": "t_water_dp" }
  },
  {
    "type": "mapgen",
    "method": "json",
    "om_terrain": [ "lake_water_cube" ],
    "object": { "fill_ter": "t_water_cube" }
  },
  {
    "type": "mapgen",
    "method": "json",
    "om_terrain": [ "lake_bed" ],
    "object": { "fill_ter": "t_lake_bed" }
  }
]
