Wonderful gorge digged into the white limestone of the Valle Roya. The descent is actually varied: first part is dry with many passages to climb down, the second one is really vertical with a few pools, in the third part there are good flow and some Rappels, then there is a long part without any great difficulty with walks, little dives and swims inside beautiful narrow pools. The spectacular narrow ending part is almost completely a long swim. Physically really hard, only for well trained canyoners, with good skill in Rappels.