Leading Grampian location, especially Nevis! (4)

I haven't cracked this one yet — but the brilliant team at Fifteensquared have:

First letters of Grampian Location Especially Nevis, &lit – Glen Nevis is overlooked by Ben Nevis, which is at the western end of the Grampian mountain range. I can recommend the walk to Steall Falls if you’re in the vicinity and don’t fancy climbing the Ben