Grand Bisse de Vex

It is popular with summer visitors who like to follow its gentle course, especially the section between the resort of Veysonnaz and les Mayens-de-Sion. Even during heat waves, the air here is pleasantly cool thanks to the shelter provided by the trees. The forest consists of conifers, mainly larches, whose fallen needles form a thick and soft carpet on the trails.


Starting point: Les Mayens-de-Sion (1'325 m)
Destination: Planchouet (1'550m)
Restaurants and pubs: Mayens-de-Sion, Veysonnaz, Verrey, Planchouet


Difficulty: medium
Distance: 12,1 km
Vertical metres: +260m, -35m
Hiking time: 3h15

Available offers

The Valais Bisses Trails - Hérens & Anniviers

In Valais, the construction of irrigation channels, which continue to characterise the image of Vala...
From 519 CHF

In the footsteps of water

The plague led to a switch to more productive livestock farming in Valais. The construction of irrigation channels, the so-called bisses in French, or Suonen in German, which continue to characterise the image of the Rhone valley even today, was started in the middle of the 13th century in order to irrigate the pastures and meadows. The mountain farmers of Valais came up with some adventurous constructions, which you will see at close range on this hike. The water runs quietly in the canals next to you and leads you from one mountain village to the next on little-used mountain paths.


Day 1: Veysonnaz - St. Martin surroundings

Alongside the Bisse de Vex to Mayens de Sion. Mighty concrete church in Hérémence, the fairytale world of the earth pyramids in Euseigne is an invitation to daydream. Ascent to St. Martin, which clings to the side of the Val d’Hérens like an eagle’s nest.

Details: approx. 20 km ↑ 1’120 m ↓ 825 m, Hiking time: approx. 6.5 h.

Day 2: St. Martin surroundings - Nax

Wonderful high-level hike above the Rhone Valley through Valais villages, on down into Vallon de Réchy. From the head of the Grand Bisse de Vercorin alongside the open suone (irrigation channels) to Réfuge du Bisse.

Details: approx. 16 km ↑ 730 m ↓ 865 m, Hiking time: approx. 5 h.

Day 3: Nax - Vercorin

A demanding stage through the Vallon de Réchy. In Vercorin, the stage stop, an old village centre worth seeing awaits you around the church.

Details: approx. 16 km ↑ 745 m ↓ 685 m, Hiking time: approx. 5 h. 

Day 4: Vercorin - Grimentz

The around 500-year-old suone (irrigation channel) «Bisse des Sarrasin» and its 17 information panels are of great historical and technical interest. The route then leads via the «Grand Bisse de St-Jean» suone to the typical Valais village of Grimentz.

Details: approx. 17 km ↑ 910 m ↓ 865 m, Hiking time: approx. 5.5 h.

Day 9: Departure or extension

Tour character

The tour requires good physical condition especially towards the end and sure-footedness and a head for heights are mandatory in places. The hikes along the bisses (Suonen) are mostly flat, but there are ascents and descents to master now and again and the rock can be slippery when it rains.


  • 4 overnight stays incl. breakfast

  • Daily luggage transfers

  • Carefully elaborated route

  • Detailed travel documents (1 x per room)

  • GPS data available

  • Service hotline 

Not included

  • Tourist tax, if due, is not included in the price!

  • Bus trips Sion - Veysonnaz or Veysonnaz - Sion are not included in the price. Approx. CHF 10

Option of additional nights - booking after your payment (you will be contacted by our booking team):

  • Grimentz: CHF 85.- (per person in a double room)

  • Single room surcharge: CHF 40.-

  • Veysonnaz : CHF 95.- (per person in a double room)

  • Single room surcharge: CHF 35.-

Cancellation conditions:

  • Up to 29 days before start of the trip: 20%

  • 28 – 15 days before start of the trip: 50%

  • 14 – 08 days before start of the trip: 70%

  • 07 – 1 days before start of the trip: 90%

  • 0 day before start of the trip / No–show: 100%

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