Welcome to the Homepage of the biggest natural
underground lake of Europe !

In Switzerland, in the Center of the Valais, between the Vintage and the Sun, is located the biggest natural underground lake of Europe. With 300m length, 20m wide, 10m depth, the underground lake is the biggest navigable in Europe. The surface of the lake is 6000m2. Discovered in 1943, it is open to visitors since 1949.

During a 30 minutes  boat trip you will enjoy the peace of this amazing place while your guide gives you all explanations about the underground Lake.

Each year, about 80'000 Persons are visiting this beautifull place.