- Category: Geographic Feature
- Type: Valley
- Latitude/Longitude: 52°3'31"N 3°54'47"W
- Eastings/Northings: 268939, 241764
- OS Grid: SN689417
- Mapcode Local: GBR DZ.DJ0D
- Mapcode Global: VH4H6.4J54
Location and coordinates are for the approximate centre of Cwm-Gerwyn-Uchaf within this administrative area.
Geographic features and populated places may cross administrative borders.