- Category: Geographic Feature
- Type: Valley
- Latitude/Longitude: 52°0'48"N 4°52'58"W
- Eastings/Northings: 202266, 238927
- OS Grid: SN022389
- Mapcode Local: GBR CP.H9J0
- Mapcode Global: VH1QH.BN09
Location and coordinates are for the approximate centre of Dyffryn-isaf within this administrative area.
Geographic features and populated places may cross administrative borders.