- Category: Water Feature
- Type: Bay
- Latitude/Longitude: 53°10'47"N 4°28'49"W
- Eastings/Northings: 234337, 367644
- OS Grid: SH343676
- Mapcode Local: GBR 57.3Q2P
- Mapcode Global: WH434.4BQH
Location and coordinates are for the approximate centre of Porth Terfyn within this administrative area.
Geographic features and populated places may cross administrative borders.