- Category: Geographic Feature
- Type: Hill or Mountain
- Latitude/Longitude: 51°52'28"N 3°20'1"W
- Eastings/Northings: 308273, 220396
- OS Grid: SO082203
- Mapcode Local: GBR YR.S3P9
- Mapcode Global: VH6CD.54DR
Location and coordinates are for the approximate centre of Twyn Du within this administrative area.
Geographic features and populated places may cross administrative borders.