- Category: Geographic Feature
- Type: Hill or Mountain
- Latitude/Longitude: 51°45'8"N 3°48'17"W
- Eastings/Northings: 275500, 207500
- OS Grid: SN755075
- Mapcode Local: GBR H2.0ZJX
- Mapcode Global: VH5G8.0790
Location and coordinates are for the approximate centre of Mynydd Allt-y-grug within this administrative area.
Geographic features and populated places may cross administrative borders.