- Category: Water Feature
- Type: Island
- Latitude/Longitude: 52°8'11"N 4°32'39"W
- Eastings/Northings: 225973, 251729
- OS Grid: SN259517
- Mapcode Local: GBR D4.7HH6
- Mapcode Global: VH2MK.5KZL
Location and coordinates are for the approximate centre of Cerrig Duon within this administrative area.
Geographic features and populated places may cross administrative borders.