- Category: Water Feature
- Type: Island
- Latitude/Longitude: 53°18'34"N 4°35'31"W
- Eastings/Northings: 227410, 382324
- OS Grid: SH274823
- Mapcode Local: GBR HM1Y.MC7
- Mapcode Global: WH42H.F2LJ
Location and coordinates are for the approximate centre of Cerrig y Gwyr within this administrative area.
Geographic features and populated places may cross administrative borders.