- Category: Water Feature
- Type: Other Water Feature
- Latitude/Longitude: 52°56'9"N 3°21'46"W
- Eastings/Northings: 308500, 338500
- OS Grid: SJ085385
- Mapcode Local: GBR 6P.M5M0
- Mapcode Global: WH787.9GWH
Location and coordinates are for the approximate centre of Nant yr Hillwyn within this administrative area.
Geographic features and populated places may cross administrative borders.