- Category: Geographic Feature
- Type: Valley
- Latitude/Longitude: 51°57'59"N 3°7'45"W
- Eastings/Northings: 322502, 230389
- OS Grid: SO225303
- Mapcode Local: GBR F1.L6CD
- Mapcode Global: VH6BX.PTYS
Location and coordinates are for the approximate centre of Cwm Grigws-Uchaf within this administrative area.
Geographic features and populated places may cross administrative borders.