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

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.

Let yourself be carried away by the magic of the lake

Holographic Show - Teaching areas - Restaurant

Schedule and tours

Opening Hours
From March 19th until November 1st every day from 10h00 to 17h00
July and August from 09h00 to 17h30

Upcoming events