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.
Adult : CHF 10.—
Child (5 to 15 years old) : CHF 6.—
Groupe from 20 people : CHF 9.—/person
Opening Open every day from March 19 to September 22 Monday - Sunday: 10am - 5pm In July and August: Monday Sunday: 09:00 - 17:30
Lac souterrain de Saint-Léonard
Rue du Lac 21
+41 27 203 22 66