- Category: Water Feature
- Type: Inland Water
- Latitude/Longitude: 51°44'18"N 3°56'21"W
- Eastings/Northings: 266189, 206210
- OS Grid: SN661062
- Mapcode Local: GBR GY.KM19
- Mapcode Global: VH4JQ.NKSK
Location and coordinates are for the approximate centre of Upper Lliw Reservoir within this administrative area.
Geographic features and populated places may cross administrative borders.