- Category: Water Feature
- Type: Island
- Latitude/Longitude: 52°5'44"N 4°44'43"W
- Eastings/Northings: 212043, 247699
- OS Grid: SN120476
- Mapcode Local: GBR CW.B1MC
- Mapcode Global: VH2MM.PLPC
Location and coordinates are for the approximate centre of Carreg Wylan within this administrative area.
Geographic features and populated places may cross administrative borders.