Description of the route
When you get to Col San Carlo, take the dirt road opposite Hotel Genzianella, signposted 15, which winds gently upwards inside the mixed beech and larch woods to reach Lac d’Arpy. Go along the left orographic bank and continue along route 15, which goes off to left of the dirt road and crosses the stream to the right orographic bank. At the end of the Arpy plain, the path starts to go up until it reaches the shores of Lake Pietra Rossa.