- Category: Geographic Feature
- Type: Valley
- Latitude/Longitude: 51°40'42"N 3°11'46"W
- Eastings/Northings: 317379, 198438
- OS Grid: ST173984
- Mapcode Local: GBR HX.5GQ9
- Mapcode Global: VH6DF.K22J
Location and coordinates are for the approximate centre of Cwm Gelli within this administrative area.
Geographic features and populated places may cross administrative borders.