- Category: Geographic Feature
- Type: Valley
- Latitude/Longitude: 51°43'5"N 3°9'2"W
- Eastings/Northings: 320611, 202786
- OS Grid: SO206027
- Mapcode Local: GBR HZ.2VM2
- Mapcode Global: VH6D8.B2RN
Location and coordinates are for the approximate centre of Cwm Big within this administrative area.
Geographic features and populated places may cross administrative borders.