300m long, 20m wide and 10m deep, this is the largest navigable underground lake in Europe.
Guided tours of this unusual and mysterious site, lasting over half an hour, are given in French, German, Italian and English.
Practical informationAdult : CHF 12.-
Child (5 to 15 years old) : CHF 7.-
OpeningOpen every day from 20th of June to 1st of November Monday - Sunday : 10 a.m. - 5 p.m. In July and August : Monday - Sunday : 9 a.m. - 5.30 p.m.
Lac souterrain de Saint-Léonard
Rue du Lac 21
+41 27 203 22 66