- Category: Geographic Feature
- Type: Valley
- Latitude/Longitude: 52°20'8"N 3°29'10"W
- Eastings/Northings: 298825, 271879
- OS Grid: SN988718
- Mapcode Local: GBR 9K.TVPS
- Mapcode Global: VH5CJ.JK8D
Location and coordinates are for the approximate centre of Cwm Is-y-rhiw within this administrative area.
Geographic features and populated places may cross administrative borders.