- Category: Populated Place
- Type: Hamlet
- Latitude/Longitude: 51°49'28"N 3°26'51"W
- Eastings/Northings: 300330, 214995
- OS Grid: SO003149
- Mapcode Local: GBR YL.WCGG
- Mapcode Global: VH6CJ.6D7J
Location and coordinates are for the approximate centre of Nant-ddu within this administrative area.
Geographic features and populated places may cross administrative borders.