[
  {
    "type": "overmap_terrain",
    "abstract": "generic_river",
    "copy-from": "generic_water",
    "name": "river",
    "sym": "R",
    "color": "blue",
    "see_cost": 1,
    "flags": [ "RIVER", "NO_ROTATE", "SOURCE_DRINK", "WATER" ]
  },
  {
    "type": "overmap_terrain",
    "abstract": "generic_river_bank",
    "copy-from": "generic_river",
    "travel_cost_type": "shore",
    "name": "river bank",
    "color": "light_blue"
  },
  {
    "type": "overmap_terrain",
    "id": "river_center",
    "copy-from": "generic_river",
    "travel_cost_type": "water",
    "mapgen": [ { "method": "builtin", "name": "river_center" } ]
  },
  {
    "type": "overmap_terrain",
    "id": "river",
    "copy-from": "generic_river_bank",
    "extras": "river",
    "mapgen": [ { "method": "builtin", "name": "river_straight" } ],
    "delete": { "flags": [ "NO_ROTATE" ] }
  },
  {
    "type": "overmap_terrain",
    "id": [ "river_c_not_ne", "river_c_not_nw", "river_c_not_se", "river_c_not_sw" ],
    "copy-from": "generic_river_bank",
    "extras": "river",
    "mapgen": [ { "method": "builtin", "name": "river_curved_not" } ]
  },
  {
    "type": "overmap_terrain",
    "id": [ "river_ne", "river_nw", "river_se", "river_sw" ],
    "extras": "river",
    "copy-from": "generic_river_bank",
    "mapgen": [ { "method": "builtin", "name": "river_curved" } ]
  }
]
