- Category: Geographic Feature
- Type: Valley
- Latitude/Longitude: 51°50'11"N 3°2'28"W
- Eastings/Northings: 328354, 215835
- OS Grid: SO283158
- Mapcode Local: GBR F4.VJ87
- Mapcode Global: VH796.73KG
Location and coordinates are for the approximate centre of Cwm Gyst Nantiago within this administrative area.
Geographic features and populated places may cross administrative borders.