Discover the undergroud lake
of St-Leonard

An immersive experience in the heart of the Swiss Alps

Reservations required

In order to guarantee access to the site, we invite you to book your visit now by clicking on the button below.

Guided tours

A multilingual guide reveals the mysteries of the lake and its origins.

Live concerts

Live events in an exceptional and atypical setting

Private events

Share this very special location with your guests for a private event

Group Visits

Fun and educational visits for classes in complete safety

Immediate boarding

Discovered in 1943 and in operation since 1949, this is one of the most fascinating places underground, just 10 minutes from Sion.perfect replica rolex watches
The “Lac Souterrain de St-Léonard” is located in Switzerland, between Sion and Sierre, in the heart of the Valais Alps. A privileged witness to the formation of the Alps, this navigable underground lake nestles in the hillside between 30 and 70 meters below the vineyards. With a length of 300 meters, it is the largest natural, navigable underground lake in Europe. As the cave is completely submerged, all visits are made aboard rowing boats for up to 40 people. In complete silence, our multilingual guides will take you on a tour of this fascinating world. During a 30-minute guided tour, you’ll glide over the clear waters of the lake and learn to decipher its mysteries. We look forward to your next visit.
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Let yourself be carried away by the magic of the lake

Holographic Show - Teaching areas - Restaurant

Schedule and tours

Opening Hours

OPEN every day.

Until november 3rd 2024, OPEN every day
from 10h00 to 17h00
July and August from 10h00 to 17h30



Upcoming events

Visite guidée en barque