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Due to COVID restrictions the underground lake remains closed at the moment.
As soon as reopening is allowed, we will publish the information on this page.
In order to guarantee access to the site, we invite you to book your visit now by clicking on the button below.
A multilingual guide reveals the mysteries of the lake and its origins.
Live events in an exceptional and atypical setting
Share this very special location with your guests for a private event
Fun and educational visits for classes in complete safety
Explored for the first time in 1943, discover one of the most fascinating underground site, 10 minutes from Sion. The subterranean lake of St-Leonard is located in Switzerland, along the Rhone valley, between Sion and Sierre in the heart of the Swiss Alps. With a length of around 300 meters this is the largest natural underground lake in Europe which can be explored by boat. During a 30 minute boat trip on the crystal clear water, you will enjoy the peace of this amazing place while your guide explains all sorts of fascinating details about the origin and the history of the underground lake. We look forward to your next visit.
As soon the COVID restrictions end, we will open every day until November 1st 2021
July and August from 09h00 to 17h30
Lac Souterrain de Saint-Léonard
CP 75, Rue du Lac 21
1958 Saint-Léonard, Suisse