- Category: Geographic Feature
- Type: Valley
- Latitude/Longitude: 52°0'5"N 3°31'51"W
- Eastings/Northings: 294993, 234777
- OS Grid: SN949347
- Mapcode Local: GBR YH.J2RF
- Mapcode Global: VH5F1.RY4J
Location and coordinates are for the approximate centre of Cwm Erchan within this administrative area.
Geographic features and populated places may cross administrative borders.