- Category: Water Feature
- Type: Inland Water
- Latitude/Longitude: 53°6'30"N 3°10'16"W
- Eastings/Northings: 321692, 357462
- OS Grid: SJ216574
- Mapcode Local: GBR 6Y.845C
- Mapcode Global: WH77K.8446
Location and coordinates are for the approximate centre of Llyn y Mynydd-du within this administrative area.
Geographic features and populated places may cross administrative borders.