- Category: Water Feature
- Type: Inland Water
- Latitude/Longitude: 52°42'14"N 3°54'50"W
- Eastings/Northings: 270774, 313528
- OS Grid: SH707135
- Mapcode Local: GBR 8Z.2QZD
- Mapcode Global: WH56V.V9CD
Location and coordinates are for the approximate centre of Llyn y Gadair within this administrative area.
Geographic features and populated places may cross administrative borders.