- Category: Water Feature
- Type: Inland Water
- Latitude/Longitude: 51°46'11"N 3°35'51"W
- Eastings/Northings: 289852, 209123
- OS Grid: SN898091
- Mapcode Local: GBR YD.ZQ76
- Mapcode Global: VH5G5.LSD2
Location and coordinates are for the approximate centre of Pwll Du ar Byrddin within this administrative area.
Geographic features and populated places may cross administrative borders.