- Category: Water Feature
- Type: Inland Water
- Latitude/Longitude: 51°32'57"N 3°44'23"W
- Eastings/Northings: 279463, 184809
- OS Grid: SS794848
- Mapcode Local: GBR H5.FQ06
- Mapcode Global: VH5H8.4B84
Location and coordinates are for the approximate centre of Eglwys Nunydd Reservoir within this administrative area.
Geographic features and populated places may cross administrative borders.