A canyon not very aquatic, best done in spring or after thunderstorms. The first part is more continuous, with a succession of waterfalls and nice narrow corridors; later it opens up, and between rappels there is quite a lot of walking.

A canyon not very aquatic, best done in spring or after thunderstorms. The first part is more continuous, with a succession of waterfalls and nice narrow corridors; later it opens up, and between rappels there is quite a lot of walking.

From the Valsesia provincial road, turn right onto the uphill road toward the hamlet of Ramello. Leave the first car there. Then, with the second car, continue up the very narrow road leading to the village of Frasso (1000 m) and park there.

Walk through Frasso until you find the trail signs for the valley routes (vallone). Follow the trail toward Balma di mezzo, di cima, etc. The path gently ascends toward the stream. After about 15 minutes (after passing two isolated huts), the trail forks: follow the unmarked lower path that continues at the same elevation until it enters the streambed (you’ll recognize it by a few yellow poles).

Immediately you’ll find the first rappel (double on a tree to the left), 15 m. A small jump. C20 right + C20 left, the second with friction at the start. C20 with a deviation after 15 m to the left. MC + C15 left (possible jump). Downclimb, MC + C18 right (a bit awkward to reach the anchor). You’ll encounter a very recent landslide that blocks the stream — climb over it; there’s a rope on a tree to the left for MC. Following a slightly ascending ledge, you reach the anchor for C15 left. Then MC + C20 right. A short walk. C20 left from a tree, with two friction points (bypass the second step). C10 right. C20 right + C20 right, short walk. C12 right. MC20 right + C20 right. C30 right. Exit at the bridge. Total: 14 rappels — approximately 4 hours of descent.