- Category: Water Feature
- Type: Other Water Feature
- Latitude/Longitude: 52°49'33"N 3°33'8"W
- Eastings/Northings: 295500, 326500
- OS Grid: SH955265
- Mapcode Local: GBR 6G.V1KP
- Mapcode Global: WH67L.D7NG
Location and coordinates are for the approximate centre of Nant Cwm-lloi within this administrative area.
Geographic features and populated places may cross administrative borders.