- Category: Geographic Feature
- Type: Valley
- Latitude/Longitude: 51°57'54"N 3°7'20"W
- Eastings/Northings: 322986, 230232
- OS Grid: SO229302
- Mapcode Local: GBR F1.L847
- Mapcode Global: VH6BX.TVPV
Location and coordinates are for the approximate centre of Cwm Grigws-Isaf within this administrative area.
Geographic features and populated places may cross administrative borders.