- Category: Geographic Feature
- Type: Valley
- Latitude/Longitude: 51°33'3"N 3°31'53"W
- Eastings/Northings: 293901, 184672
- OS Grid: SS939846
- Mapcode Local: GBR HG.FGDS
- Mapcode Global: VH5HC.Q8TX
Location and coordinates are for the approximate centre of Cwm Crymlyn within this administrative area.
Geographic features and populated places may cross administrative borders.