{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "schema:Landform",
  "title": "Landform",
  "description": "A landform or physical feature.  Landform elements include mountains, plains, lakes, rivers, seascape and oceanic waterbody interface features such as bays, peninsulas, seas and so forth, including sub-aqueous terrain features such as submersed mountain ranges, volcanoes, and the great ocean basins.",
  "type": "object",
  "allOf": [
    {
      "description": "Entities that have a somewhat fixed, physical extension.",
      "$ref": "schema:Place"
    }
  ]
}