Bisses are the historic irrigation channels of the Valais. A bisse is an open ditches delivering priceless water from mountain streams – often by daring routes – to arid pastures and fields, vineyards and orchards. Many bisses are still in use today and so are carefully maintained. Numerous trails accompany these historic watercourses, inviting visitors to varied hikes on historic trails.
Bisse de Clavau
Surrounded by enormous drystone walls, it is used for spray-irrigation of the vineyards of Ayent, Grimisuat and Sion. The footpath allows walkers to follow the old route with its corbelled structures, overhanging sections supported by wooden girders and a short tunnel; local produce can be sampled at several stalls along the way.
Destination: Sion (491m)
Distance: 13,5 km
Vertical metres: +20m, -560m
Hiking time: 3h10
Restaurants and pubs: Icogne, Chmplan, Sion