- Category: Water Feature
- Type: Island
- Latitude/Longitude: 53°18'13"N 4°35'18"W
- Eastings/Northings: 227624, 381659
- OS Grid: SH276816
- Mapcode Local: GBR HM1Z.30M
- Mapcode Global: WH42H.H782
Location and coordinates are for the approximate centre of Cerrig yr Adar within this administrative area.
Geographic features and populated places may cross administrative borders.