Lac Souterrain

Once off the train it was down twisty roads to the valley below. We stopped at Lac Souterrain at Saint-Léonard. The subterranean lake is located 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.Læs mere