- Category: Geographic Feature
- Type: Valley
- Latitude/Longitude: 52°32'54"N 3°46'0"W
- Eastings/Northings: 280295, 295977
- OS Grid: SN802959
- Mapcode Local: GBR 95.DK7F
- Mapcode Global: VH5BD.N6HN
Location and coordinates are for the approximate centre of Cwm yr Erw within this administrative area.
Geographic features and populated places may cross administrative borders.