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Underground lake

Cave · Sierre · 512 m
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  • Underground lake in St. Leonard
    / Underground lake in St. Leonard
    Photo: Valais
The mysterious cavern was discovered in 1943 by Jean-Jacques Pittard, but the lake was not open to the public until 1949. The St. Leonard underground lake is the largest of its kind in Europe: it is 300m long and 20m wide. The boat trip to the lake lasts over half an hour and can accommodate up to 40 people (commentary is available in several languages). A superb terrace provides a magnificent view of Valère and Tourbillon castles, in addition to a view of the whole Rhone valley up to Martigny.
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Valais/Wallis Promotion
Update: November 27, 2017


2'599'027E 1'122'839N
46.256977, 7.426020
46°15'25.1"N 7°25'33.7"E
32T 378689 5123804
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Underground lake

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