- Category: Geographic Feature
- Type: Hill or Mountain
- Latitude/Longitude: 51°40'35"N 2°51'51"W
- Eastings/Northings: 340331, 197880
- OS Grid: ST403978
- Mapcode Local: GBR JC.5N6M
- Mapcode Global: VH7B2.94L4
Location and coordinates are for the approximate centre of Gwern-Ddu Hill within this administrative area.
Geographic features and populated places may cross administrative borders.