- Category: Geographic Feature
- Type: Hill or Mountain
- Latitude/Longitude: 53°8'54"N 3°56'53"W
- Eastings/Northings: 269800, 363038
- OS Grid: SH698630
- Mapcode Local: GBR 5Y.5MCD
- Mapcode Global: WH54Q.B433
Location and coordinates are for the approximate centre of Pen yr Helgi Du within this administrative area.
Geographic features and populated places may cross administrative borders.