- Category: Water Feature
- Type: Inland Water
- Latitude/Longitude: 52°59'13"N 3°7'36"W
- Eastings/Northings: 324453, 343917
- OS Grid: SJ244439
- Mapcode Local: GBR 70.HWGK
- Mapcode Global: WH784.Y56S
Location and coordinates are for the approximate centre of Cefn-y-fedw Reservoir within this administrative area.
Geographic features and populated places may cross administrative borders.