- Category: Water Feature
- Type: Island
- Latitude/Longitude: 53°21'14"N 4°34'24"W
- Eastings/Northings: 228826, 387216
- OS Grid: SH288872
- Mapcode Local: GBR HM2T.XJQ
- Mapcode Global: WH423.QYDK
Location and coordinates are for the approximate centre of Carreg-y-frân within this administrative area.
Geographic features and populated places may cross administrative borders.