- Category: Geographic Feature
- Type: Hill or Mountain
- Latitude/Longitude: 51°59'24"N 3°50'16"W
- Eastings/Northings: 273904, 233992
- OS Grid: SN739339
- Mapcode Local: GBR Y2.JYG9
- Mapcode Global: VH4HM.F7GT
Location and coordinates are for the approximate centre of Allt Ddu within this administrative area.
Geographic features and populated places may cross administrative borders.