- Category: Water Feature
- Type: Island
- Latitude/Longitude: 52°48'5"N 4°41'59"W
- Eastings/Northings: 218101, 326093
- OS Grid: SH181260
- Mapcode Local: GBR GPR9.5ZL
- Mapcode Global: WH33M.SV63
Location and coordinates are for the approximate centre of Carreg Gyfrwy within this administrative area.
Geographic features and populated places may cross administrative borders.