- Category: Water Feature
- Type: Island
- Latitude/Longitude: 52°7'47"N 4°41'11"W
- Eastings/Northings: 216205, 251357
- OS Grid: SN162513
- Mapcode Local: GBR CY.7XX5
- Mapcode Global: VH2MG.QQ7L
Location and coordinates are for the approximate centre of Carreg Lydan within this administrative area.
Geographic features and populated places may cross administrative borders.