- Category: Water Feature
- Type: Inland Water
- Latitude/Longitude: 51°42'41"N 4°8'42"W
- Eastings/Northings: 251891, 203606
- OS Grid: SN518036
- Mapcode Local: GBR GT.86QC
- Mapcode Global: VH4JT.37HQ
Location and coordinates are for the approximate centre of Cwm Lliedi Reservoir within this administrative area.
Geographic features and populated places may cross administrative borders.