- Category: Water Feature
- Type: Inland Water
- Latitude/Longitude: 52°18'46"N 3°45'43"W
- Eastings/Northings: 279972, 269780
- OS Grid: SN799697
- Mapcode Local: GBR 96.WDC1
- Mapcode Global: VH5CK.Q4Y5
Location and coordinates are for the approximate centre of Llyn Du within this administrative area.
Geographic features and populated places may cross administrative borders.