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Discover Europe's largest Underground Lake
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
Tours and schedule
Opening Hours
Every day from June 7 to November 1, 2020
from 10:00 am to 5:00 pm
July and August
from 09h00 to 17h30
