- Category: Geographic Feature
- Type: Hill or Mountain
- Latitude/Longitude: 51°45'21"N 3°48'39"W
- Eastings/Northings: 275101, 207928
- OS Grid: SN751079
- Mapcode Local: GBR H2.0J48
- Mapcode Global: VH4JS.W4N3
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.