- Category: Geographic Feature
- Type: Valley
- Latitude/Longitude: 51°24'32"N 3°33'20"W
- Eastings/Northings: 291902, 168907
- OS Grid: SS919689
- Mapcode Local: GBR HF.QGCH
- Mapcode Global: VH5HY.BV49
Location and coordinates are for the approximate centre of Cwm Marcroes within this administrative area.
Geographic features and populated places may cross administrative borders.