- Category: Water Feature
- Type: Inland Water
- Latitude/Longitude: 52°39'23"N 3°9'12"W
- Eastings/Northings: 322066, 307149
- OS Grid: SJ220071
- Mapcode Local: GBR B0.5L8G
- Mapcode Global: WH79P.JHH9
Location and coordinates are for the approximate centre of Llyn Du within this administrative area.
Geographic features and populated places may cross administrative borders.