- Category: Geographic Feature
- Type: Hill or Mountain
- Latitude/Longitude: 53°8'43"N 3°49'58"W
- Eastings/Northings: 277500, 362500
- OS Grid: SH775625
- Mapcode Local: GBR 62.5Z9F
- Mapcode Global: WH65X.361D
Location and coordinates are for the approximate centre of Grinllwm within this administrative area.
Geographic features and populated places may cross administrative borders.