- Category: Water Feature
- Type: Inland Water
- Latitude/Longitude: 52°57'37"N 4°8'28"W
- Eastings/Northings: 256263, 342471
- OS Grid: SH562424
- Mapcode Local: GBR 5P.KGH3
- Mapcode Global: WH55D.CV5F
Location and coordinates are for the approximate centre of Llyn Du within this administrative area.
Geographic features and populated places may cross administrative borders.