- Category: Geographic Feature
- Type: Hill or Mountain
- Latitude/Longitude: 51°56'9"N 3°7'34"W
- Eastings/Northings: 322667, 227002
- OS Grid: SO226270
- Mapcode Local: GBR F1.N74D
- Mapcode Global: VH6C3.RLMN
Location and coordinates are for the approximate centre of Twyn Du within this administrative area.
Geographic features and populated places may cross administrative borders.