- Category: Water Feature
- Type: Island
- Latitude/Longitude: 52°1'27"N 4°53'38"W
- Eastings/Northings: 201544, 240178
- OS Grid: SN015401
- Mapcode Local: GBR CP.GLQ5
- Mapcode Global: VH1QH.4C2Y
Location and coordinates are for the approximate centre of Carreg y Defaid within this administrative area.
Geographic features and populated places may cross administrative borders.