- Category: Geographic Feature
- Type: Valley
- Latitude/Longitude: 52°21'20"N 4°3'29"W
- Eastings/Northings: 259930, 275078
- OS Grid: SN599750
- Mapcode Local: GBR 8S.SRFV
- Mapcode Global: VH4FR.L1ZW
Location and coordinates are for the approximate centre of Cwm Perlla within this administrative area.
Geographic features and populated places may cross administrative borders.