- Category: Geographic Feature
- Type: Valley
- Latitude/Longitude: 53°0'32"N 4°2'0"W
- Eastings/Northings: 263658, 347674
- OS Grid: SH636476
- Mapcode Local: GBR 5T.GJN5
- Mapcode Global: WH558.0MJL
Location and coordinates are for the approximate centre of Cwm Gelli-Lago within this administrative area.
Geographic features and populated places may cross administrative borders.