- Category: Water Feature
- Type: Other Water Feature
- Latitude/Longitude: 51°50'18"N 3°25'51"W
- Eastings/Northings: 301500, 216500
- OS Grid: SO015165
- Mapcode Local: GBR YM.V9LJ
- Mapcode Global: VH6CJ.H200
Location and coordinates are for the approximate centre of Nant Ddu within this administrative area.
Geographic features and populated places may cross administrative borders.