Underground lake of St-Léonard.
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In the heart of the Valais Alps, between Sion and Sierre, take an unusual trip 70 metres below ground.
Large rowing boats that can hold up to 40 people take you for a guided tour of the largest underground lake in Europe. Adults can immerse themselves in the geology and formation of the caves, while the littles ones marvel at the magical atmosphere and the huge trout swimming in the clear water right by the boat.