Starting from the village of Prè, a steep paved road winds its way through loc. Madonna del Cenile to reach Leano. Following the tractor path you arrive at the bottom of the valley, then the path begins to climb in a series of sharp bends as far as the Malga Vil and the Passo Guil where it joins up with path 422 coming from Pregasina. Following an old military mule track, you continue along the southern slope of Mount Carone to Bocca dei Fortini and Passo Nota where you can still see the Italian military emplacements of the World War I. You then walk downhill a path until you are half-way down the mountain slope where you join the forest road that leads to Pian di Pur.
