- Category: Water Feature
- Type: Bay
- Latitude/Longitude: 51°53'38"N 5°18'24"W
- Eastings/Northings: 172569, 226887
- OS Grid: SM725268
- Mapcode Local: GBR C4.QSFC
- Mapcode Global: VH0TC.YNVF
Location and coordinates are for the approximate centre of Porth Mawr within this administrative area.
Geographic features and populated places may cross administrative borders.