- Category: Water Feature
- Type: Island
- Latitude/Longitude: 51°57'46"N 5°6'24"W
- Eastings/Northings: 186648, 233924
- OS Grid: SM866339
- Mapcode Local: GBR CD.LFY7
- Mapcode Global: VH1QK.FXJP
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.