- Category: Geographic Feature
- Type: Valley
- Latitude/Longitude: 51°45'22"N 3°13'43"W
- Eastings/Northings: 315294, 207105
- OS Grid: SO152071
- Mapcode Local: GBR HW.0DLH
- Mapcode Global: VH6D1.0401
Location and coordinates are for the approximate centre of Cwm Sirhywi within this administrative area.
Geographic features and populated places may cross administrative borders.