- Category: Water Feature
- Type: Inland Water
- Latitude/Longitude: 52°52'40"N 3°52'58"W
- Eastings/Northings: 273389, 332832
- OS Grid: SH733328
- Mapcode Local: GBR 60.QR9N
- Mapcode Global: WH55X.BX9J
Location and coordinates are for the approximate centre of Llyn Gelli-Gain within this administrative area.
Geographic features and populated places may cross administrative borders.