- Category: Water Feature
- Type: Island
- Latitude/Longitude: 52°56'16"N 4°32'47"W
- Eastings/Northings: 228969, 340873
- OS Grid: SH289408
- Mapcode Local: GBR 55.LS29
- Mapcode Global: WH448.4F82
Location and coordinates are for the approximate centre of Cerrig Gleision within this administrative area.
Geographic features and populated places may cross administrative borders.