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.
Some academics trace the name “Heido” back to the expression “Heidenleitung” or “Heathen (Pre-Christian) Channel”, suggesting that this bisse was built in the Roman era. The first historical mention of the Heido dates back to 1305, but there are only a few written records of this sort before this date in the Valais.
Destination: Giw (2'006m)
Distance: 17.5 km
Vertical metres: +610m, -650m
Hiking time: 5h20
Restaurants and pubs: Simplonpass, Giw