Gndevank Monastery sits in the Arpa River gorge, a compact medieval complex where the stonework and the canyon setting do equal work. From Jermuk it makes a strong short excursion, especially if you want Armenia's monastery landscape without a long detour.
The road and gorge are part of the pleasure. Go slowly, look for the carved details, and leave time for the landscape around the monastery rather than treating it as a quick photo stop.