- Category: Water Feature
- Type: Inland Water
- Latitude/Longitude: 52°42'22"N 3°13'30"W
- Eastings/Northings: 317313, 312774
- OS Grid: SJ173127
- Mapcode Local: GBR 9X.2DMP
- Mapcode Global: WH79G.F7DM
Location and coordinates are for the approximate centre of Llyn Du within this administrative area.
Geographic features and populated places may cross administrative borders.