- Category: Geographic Feature
- Type: Valley
- Latitude/Longitude: 53°0'45"N 3°50'58"W
- Eastings/Northings: 276003, 347749
- OS Grid: SH760477
- Mapcode Local: GBR 62.G7B3
- Mapcode Global: WH55B.TJZT
Location and coordinates are for the approximate centre of Cwm Penmachno within this administrative area.
Geographic features and populated places may cross administrative borders.