- Category: Water Feature
- Type: Island
- Latitude/Longitude: 52°56'56"N 4°33'53"W
- Eastings/Northings: 227783, 342142
- OS Grid: SH277421
- Mapcode Local: GBR 54.L7M0
- Mapcode Global: WH447.V4GM
Location and coordinates are for the approximate centre of Carreg Ddû within this administrative area.
Geographic features and populated places may cross administrative borders.