Sentiero 425: Azzone - Passo di Corna Busa

The trail starts near the Azzone football field at the bridge on Nena Valley (965 m). The first stretch it is forest road and then becomes a path climbing in the woods to Le Some hut (1436 m). the path follows eastward on a forest road overlapped with 419 path up to 1500 m. Follow climbing through pastures and woodland reaching Negrino hut (1631 m) and finally Corna Busa Pass (1940 m – Crossroad with 423 path).