- Category: Geographic Feature
- Type: Valley
- Latitude/Longitude: 51°43'31"N 3°51'43"W
- Eastings/Northings: 271491, 204593
- OS Grid: SN714045
- Mapcode Local: GBR H0.2H9F
- Mapcode Global: VH4JS.0WNR
Location and coordinates are for the approximate centre of Cwm-du within this administrative area.
Geographic features and populated places may cross administrative borders.