- Category: Water Feature
- Type: Wetland
- Latitude/Longitude: 53°10'41"N 4°27'39"W
- Eastings/Northings: 235630, 367382
- OS Grid: SH356673
- Mapcode Local: GBR 58.3W93
- Mapcode Global: WH434.FCYY
Location and coordinates are for the approximate centre of Carreg Ddewin within this administrative area.
Geographic features and populated places may cross administrative borders.