- Category: Geographic Feature
- Type: Valley
- Latitude/Longitude: 53°9'14"N 3°56'41"W
- Eastings/Northings: 270041, 363654
- OS Grid: SH700636
- Mapcode Local: GBR 5Y.5863
- Mapcode Global: WH54J.CZPC
Location and coordinates are for the approximate centre of Cwm Eigiau within this administrative area.
Geographic features and populated places may cross administrative borders.