River (Mouth) is a Location Type in Animal Crossing: New Horizons.
{ "id": "river-mouth", "type": "LocationType", "data": { "name": "River (Mouth)", "Fish-LOCATION-LocationType": { "salmon__Fish-LOCATION__river-mouth": true, "king-salmon__Fish-LOCATION__river-mouth": true, "sturgeon__Fish-LOCATION__river-mouth": true } }, "updatedAt": 1586208302101 }