Description of the route

When you get to Rosière, in the municipality of Saint-Rhémy, where there is parking space near the Crévacol lift facilities, take the road for Farettes, soon reached after going under the overpass across the road towards the tunnel. From here, leave the road and continue left on route 9, until you come to Arp du Bois Désot (1936 m). Continue up on a short section of the dirt road until you meet route 9 again on the left. From here continue until you get to Col Serena.
This easy climbing excursion in the pastures of the high valley of Gran San Bernardo, amidst the spontaneous flora, white limestone rock, and the fauna that inhabits this wonderful area of the Alps. From the mountain pass, the valley opens onto the magnificent Vertosan basin, dotted with pastures and almost unknown.