- Category: Water Feature
- Type: Inland Water
- Latitude/Longitude: 52°59'11"N 3°52'12"W
- Eastings/Northings: 274558, 344863
- OS Grid: SH745448
- Mapcode Local: GBR 61.HVRW
- Mapcode Global: WH55J.J69D
Location and coordinates are for the approximate centre of Llyn Bryn-du within this administrative area.
Geographic features and populated places may cross administrative borders.