- Category: Water Feature
- Type: Bay
- Latitude/Longitude: 50°0'54"N 5°15'30"W
- Eastings/Northings: 166650, 17861
- OS Grid: SW666178
- Mapcode Local: GBR Z2.J1QZ
- Mapcode Global: VH13H.SWV9
Location and coordinates are for the approximate centre of Porth Mellin within this administrative area.
Geographic features and populated places may cross administrative borders.