- Category: Water Feature
- Type: Inland Water
- Latitude/Longitude: 53°11'5"N 4°14'58"W
- Eastings/Northings: 249777, 367673
- OS Grid: SH497676
- Mapcode Local: GBR 5K.365B
- Mapcode Global: WH437.P6KQ
Location and coordinates are for the approximate centre of Llyn Llwyn Du within this administrative area.
Geographic features and populated places may cross administrative borders.