- Category: Geographic Feature
- Type: Valley
- Latitude/Longitude: 51°52'14"N 3°3'16"W
- Eastings/Northings: 327498, 219640
- OS Grid: SO274196
- Mapcode Local: GBR F4.S6ZD
- Mapcode Global: VH790.07KV
Location and coordinates are for the approximate centre of Cwm Nant-Du within this administrative area.
Geographic features and populated places may cross administrative borders.