- Category: Water Feature
- Type: Bay
- Latitude/Longitude: 53°12'16"N 4°30'1"W
- Eastings/Northings: 233099, 370406
- OS Grid: SH330704
- Mapcode Local: GBR 56.258C
- Mapcode Global: WH42X.VQ47
Location and coordinates are for the approximate centre of Porth Terfyn within this administrative area.
Geographic features and populated places may cross administrative borders.