- Category: Populated Place
- Type: Village
- Latitude/Longitude: 51°42'38"N 4°13'39"W
- Eastings/Northings: 246194, 203681
- OS Grid: SN461036
- Mapcode Local: GBR GR.B8Y8
- Mapcode Global: VH3M9.N8XF
Location and coordinates are for the approximate centre of Heol-ddu within this administrative area.
Geographic features and populated places may cross administrative borders.