- Category: Water Feature
- Type: Other Water Feature
- Latitude/Longitude: 52°16'36"N 3°35'30"W
- Eastings/Northings: 291500, 265500
- OS Grid: SN915655
- Mapcode Local: GBR 9F.YLBF
- Mapcode Global: VH5CV.P1KB
Location and coordinates are for the approximate centre of Garreg-ddu Reservoir within this administrative area.
Geographic features and populated places may cross administrative borders.