- Category: Geographic Feature
- Type: Hill or Mountain
- Latitude/Longitude: 53°8'42"N 3°49'53"W
- Eastings/Northings: 277594, 362440
- OS Grid: SH775624
- Mapcode Local: GBR 62.5ZP7
- Mapcode Global: WH65X.36PT
Location and coordinates are for the approximate centre of Grinllwm within this administrative area.
Geographic features and populated places may cross administrative borders.