- Category: Geographic Feature
- Type: Valley
- Latitude/Longitude: 52°37'39"N 3°51'47"W
- Eastings/Northings: 273989, 304954
- OS Grid: SH739049
- Mapcode Local: GBR 91.7KH3
- Mapcode Global: WH578.M6LW
Location and coordinates are for the approximate centre of Cwm Siambar Wmffre within this administrative area.
Geographic features and populated places may cross administrative borders.