- Category: Geographic Feature
- Type: Valley
- Latitude/Longitude: 52°50'56"N 3°33'1"W
- Eastings/Northings: 295690, 329057
- OS Grid: SH956290
- Mapcode Local: GBR 6G.SG24
- Mapcode Global: WH67D.FNLB
Location and coordinates are for the approximate centre of Cwm yr Aethnen within this administrative area.
Geographic features and populated places may cross administrative borders.