Altitude of source 1850m Length 32km Date of construction from 1863 32km long! This is indeed the longest Bisse of the Valais region. Its course begins passing through the alpine regions of Tortin and Siviez and then cuts through a spruce tree forest up to the level of Haute-Nendaz. Its route continues towards the alpine region of Pra da Dzeu and rejoins the hundreds of larch trees of the mayens of Dzora. Traversing the Forêt Verte (Green Forest) it threads through to Tzoumaz. After jumping over the dévaloirs' hanging over Ecône, it finishes its course in a vertical direction to Saxon