- Category: Water Feature
- Type: Bay
- Latitude/Longitude: 53°20'36"N 4°34'11"W
- Eastings/Northings: 229023, 386033
- OS Grid: SH290860
- Mapcode Local: GBR HM2V.ZFD
- Mapcode Global: WH429.S734
Location and coordinates are for the approximate centre of Porth Trefadog within this administrative area.
Geographic features and populated places may cross administrative borders.