- Category: Water Feature
- Type: Inland Water
- Latitude/Longitude: 51°52'4"N 4°17'49"W
- Eastings/Northings: 241947, 221303
- OS Grid: SN419213
- Mapcode Local: GBR DG.SJSS
- Mapcode Global: VH3LH.G9PX
Location and coordinates are for the approximate centre of Cwm-oernant Reservoirs within this administrative area.
Geographic features and populated places may cross administrative borders.