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Col du Frenay (1600m) walks
The Grand Som loop via the south ridge and the Monastère de la Gde Charteuse
Visorando member 
12.65 km
+1,222 m
-1,228 m
7h 05
Difficult
Departure from Saint-Pierre-de-Chartreuse (Isère)
A magnificent hike that combines a natural section starting with a climb through the forest, continuing over the pleasant Pas de La Suiffière and then the easy but aerial ascent of the south ridge of the Grand Som, with a cultural section exploring the Monastère de la Grande Chartreuse, a veritable work of architectural art.