Lac Souterrain St-Léonard © Olivier Maire
Lac Souterrain St-Léonard © Olivier Maire
Lac Souterrain St-Léonard © Olivier Maire

The subterranean lake of St-Leonard

The largest underground lake of Europe

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.

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