Saint-Léonard – The underground lake

Visit Europe's largest underground lake and taste Valais wines

A visit to Europe’s largest underground lake

CHF 81.- / adult

Sail the blue waters of Europe’s largest underground lake. An immersive experience in the heart of the Valais Alps.

After this magical cruise, you’ll stop off in the vineyards of Sion to sample typical Valais dishes. Your journey continues at the Celliers de Sion, where you can taste the indigenous wines of the Valais.

Every day
Departure ~ 10 a.m.
~ 6h30
This activity is only available for groups of 10 or more from April to October.

Step 1

Saint-Léonard underground lake

Board a boat for a guided tour.

Step 2

Typical Valais meal

Our two options

Option 1: La Guérite Brûlefer

Valid for groups of less than 20 people.

  • Menu: Valais Raclette PDO. Drinks not included.
  • Access: On foot only.
  • Parking options: Celliers de Sion, Parking de Champlan, Mazots.

Option 2 :
Les Mazots du Clos du Château

Valid for groups of more than 20 people.

Step 3

Oenoparc des Celliers de Sion

Discover our winegrowing heritage through an educational educational trail designed inside the center. Your guide will then take you on a tasting of five wines from the Bonvin and Varone houses.

Les Celliers de Sion

Book the Lac Souterrain package

The Underground Lake package is only available from for a minimum of 10 people , and only from April to October.

Please note : transport from one venue to another is not included.

The proposed schedule is adaptable to your needs.

If you would like to make a reservation or find out more about this package, please send us your request. You can also contact us by telephone on 027 205 65 23.

Lac Souterrain Saint Léonard

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For bookings within 24 hours, please contact us by telephone on 027 205 65 25.

Frequently asked questions

Is the activity suitable for your children?

Yes and No. The underground lake and meal sections are suitable for younger visitors, while the discovery trail is more suitable for adults.

However, you can pay 7.00 € per child from 5 to 15 years old for the visit of the underground lake directly at Celliers de Sion as well as the menu on site instead of the meal (12.00 € per child under 12 years old at Brûlefer).

What happens if there are fewer than 10 of us?

You can’t take advantage of this package if there are fewer than 10 of you, as it’s a preferential price.

However, you can book each service independently on the following links:

  • Here for Lac souterrain de Saint-Léonard
  • Here for Guérîte Brûlefer
  • Here for the Celliers de Sion discovery tour

What happens in bad weather?

You have the option of rescheduling or cancelling the activity depending on weather conditions, at the latest the day before the activity.

In the event of bad weather, we reserve the right to close our booths and cancel our outdoor activities. You will, of course, be personally informed should this happen.

How long does each stage take?

Lac Souterrain 30-minute cruise, not including discovery of the educational area, i.e. about 1 hour.

Meals, please allow 1h30 to 2 hours.

Discovery tour (approx. 1h30), including tasting.

How do I get to the various locations?

Your private vehicle is recommended, with parking facilities close by at every location except the Brûlefer gatehouse (15-minute walk from the champlan parking lot at the start of the Clavau bisse).

If you come to Sion by train, how do you get from one stage to the next?

You can book a bus or coach with local transport companies. You will be responsible for the cost. Here are the links:

What schedule do we recommend for this package?

We recommend you start at the underground lake from 10:00-10:30 a.m.

You’ll be able to get to your meal from 11:30 a.m.-12 p.m.

To finish with the discovery tour from 2:30-3 p.m.

Discounts on wine orders in the Valais

Combine and enjoy

10% off your wine order

Each time you take part in one of our wine tourism activities, you'll be entitled to a 10% discount on your wine order on the day of your visit.

Age verification

Please confirm that you are of legal drinking age in your country.