The first leg of the 5-stage Tour du Val d’Hérens actually leads along a side valley: the Val d’Hérémence. The entire stage lies above 2,000 m, making for spectacular views of the valley, the mighty Grande Dixence dam and the snow-capped summits beyond.
The trail follows a scenic route along the valley’s western flank, threading through alpine pastures and a natural gem: Les Gouilles d’Essertze. These tranquil ponds are set among peat bogs more than 13,000 years old; info panels showcase the local wildlife. This makes an ideal picnic site – alternatively stop for refreshments at the Cabane d’Essertze, soon afterwards.
As the walk progresses, the sight of the finish point becomes ever more dramatic. The Grande Dixence is the world’s tallest gravity dam: 285 m tall, with a base 200 m wide and weighing some 15 million tons – more than the Great Pyramid of Giza. Its reservoir, the Lac des Dix, is the largest in Switzerland, and can hold 400 billion litres of water.
The dam forms the heart of a vast complex that is more impressive still. About 100 km of tunnels under the mountains collect meltwater from 35 Valais glaciers for storage in an interconnected group of reservoirs. The pioneering complex also includes 4 pumping stations and 3 power stations with a total output of 2,000 MW. One of these power stations alone holds 3 world records, including the greatest drop height (1,883 m). Taken as a whole, Switzerland’s largest hydroelectric plant accounts for 20% of the country’s energy storage capacity, generating enough electricity to power the equivalent of 500,000 homes.
Visitor facilities at the dam include an information centre (free admission), guided tours, a restaurant and a cable car to the crest.
- High panoramic trail – spectacular views all along
- Les Gouilles d’Essertze – idyllic group of alpine ponds
- Grande Dixence – Switzerland’s tallest dam
Use of the trails and the information on this website is at hikers’ own risk. Local conditions may entail changes to routes. Valais/Wallis Promotion accepts no liability for the accuracy and completeness of information on this website.
For all hikes:
- Bring a map. Download full description of this route including large-scale map by clicking on «Print» icon, top right of this page.
- Use marked trails only, and observe all signposting – for your own safety, to safeguard grazing animals and to avoid disturbing wildlife.
- Close gates after passing through.
- Please be considerate to other trail users, and to the plants and animals.
- Do not leave any waste in nature.
For mountain hikes:
- Take extra care protecting yourself from the sun at altitude. UV radiation can be exceptionally strong, even in cloudy weather.
- Plan hike carefully: take into consideration fitness level of each participant, weather forecast and season.
- Weather conditions can change quickly in the mountains, without warning. Appropriate clothing is therefore essential, along with adequate supplies of food and water. In uncertain weather, turn back in good time.
For high-altitude hikes:
- Inform others of the route you plan to take. Whenever possible, avoid going alone.
- Do not venture onto glaciers without a mountain guide.
- Take note of the warning signs that point out the constant danger in river beds and along watercourses below dams and reservoirs: water levels may rise rapidly without warning.
Tips and hints
More information about the destination:
Getting thereA9 motorway, exit 27 (Sion-Est), follow signs for Vex, then Les Collons/Thyon.
ParkingParking available at Thyon 2000. To return here from Grande Dixence dam, take postal bus towards Sion, change at road junction near Vex (bus stop «Vex – bifurcation d’Hérémence»). Alternatively, to reduce driving time, park lower down the valley – e.g. at Vex – and travel by postal bus to the start of the walk and back from the finish.
Book recommendation by the author
Author’s map recommendations
- good footwear
- clothing suitable for the weather: always carry a waterproof jacket
- hat or cap
- bottle for water
- binoculars (optional)
- hiking poles (optional)
- printout of this hike (click «Print» icon, to download)
For certain walks: