- Category: Geographic Feature
- Type: Valley
- Latitude/Longitude: 52°25'17"N 3°27'29"W
- Eastings/Northings: 300944, 281392
- OS Grid: SO009813
- Mapcode Local: GBR 9L.NH8M
- Mapcode Global: VH68M.0DQJ
Location and coordinates are for the approximate centre of Cwm Diffwys within this administrative area.
Geographic features and populated places may cross administrative borders.