- Category: Geographic Feature
- Type: Valley
- Latitude/Longitude: 52°25'53"N 4°2'27"W
- Eastings/Northings: 261334, 283477
- OS Grid: SN613834
- Mapcode Local: GBR 8T.MX9V
- Mapcode Global: VH4FC.X40R
Location and coordinates are for the approximate centre of Cwm yr Allt within this administrative area.
Geographic features and populated places may cross administrative borders.