- Category: Water Feature
- Type: Bay
- Latitude/Longitude: 51°56'56"N 5°11'41"W
- Eastings/Northings: 180539, 232648
- OS Grid: SM805326
- Mapcode Local: GBR C8.MJ39
- Mapcode Global: VH0T7.X81T
Location and coordinates are for the approximate centre of Porth Dwfn within this administrative area.
Geographic features and populated places may cross administrative borders.