- Category: Water Feature
- Type: Other Water Feature
- Latitude/Longitude: 52°55'43"N 3°53'53"W
- Eastings/Northings: 272500, 338500
- OS Grid: SH725385
- Mapcode Local: GBR 60.MFK8
- Mapcode Global: WH55Q.2NZ4
Location and coordinates are for the approximate centre of Nant Twll-y-cwm within this administrative area.
Geographic features and populated places may cross administrative borders.