- Category: Water Feature
- Type: Inland Water
- Latitude/Longitude: 51°45'28"N 3°3'38"W
- Eastings/Northings: 326896, 207121
- OS Grid: SO268071
- Mapcode Local: GBR J3.0DVM
- Mapcode Global: VH79K.W2VN
Location and coordinates are for the approximate centre of Cwmavon Reservoir within this administrative area.
Geographic features and populated places may cross administrative borders.