- Category: Water Feature
- Type: Inland Water
- Latitude/Longitude: 52°15'57"N 3°36'1"W
- Eastings/Northings: 290878, 264308
- OS Grid: SN908643
- Mapcode Local: GBR 9D.ZB6G
- Mapcode Global: VH5CV.J9YN
Location and coordinates are for the approximate centre of Cronfa Ddwr Garreg-ddu within this administrative area.
Geographic features and populated places may cross administrative borders.