- Category: Water Feature
- Type: Bay
- Latitude/Longitude: 52°6'50"N 4°43'17"W
- Eastings/Northings: 213749, 249680
- OS Grid: SN137496
- Mapcode Local: GBR CX.8TSB
- Mapcode Global: VH2MN.34R7
Location and coordinates are for the approximate centre of Ogof Grôyn within this administrative area.
Geographic features and populated places may cross administrative borders.