- Category: Geographic Feature
- Type: Valley
- Latitude/Longitude: 52°9'2"N 3°27'39"W
- Eastings/Northings: 300147, 251288
- OS Grid: SO001512
- Mapcode Local: GBR YL.6N5V
- Mapcode Global: VH5DH.Y6RJ
Location and coordinates are for the approximate centre of Cwm Llewelyn within this administrative area.
Geographic features and populated places may cross administrative borders.