- Category: Water Feature
- Type: Bay
- Latitude/Longitude: 51°58'9"N 5°6'3"W
- Eastings/Northings: 187094, 234643
- OS Grid: SM870346
- Mapcode Local: GBR CD.L3FP
- Mapcode Global: VH1QK.JRQM
Location and coordinates are for the approximate centre of Porth Mawr within this administrative area.
Geographic features and populated places may cross administrative borders.