Lac Souterrain - Saint-Léonard, VS, Switzerland
Posted by: Groundspeak Premium Member fi67
N 46° 15.409 E 007° 25.553
32T E 378678 N 5123786
The underground lake of Saint-Léonard is Europe's largest known natural underground lake.
Waymark Code: WM177ED
Location: Valais, Switzerland
Date Posted: 12/29/2022
Published By:Groundspeak Premium Member bluesnote
Views: 0

EN: On the northern edge of the village of Saint-Léonard is the entrance to the underground lake. This lake is the largest known underground lake in Europe. The lake is about 300 meters long and about 20 meters wide. The water temperature is 11 degrees all year round.

Its existence has been known to the locals for centuries, but it was not until 1943 that it was first explored. At that time the water level was almost at the cave ceiling. The great earthquake of January 1946 caused the water to sink a few meters and settle at its present level. Since 1949, boat tours have been offered on the lake. Between 2000 and 2003, the cave had to be closed and secured because a boulder had come loose from the ceiling.

The boat tours are conducted by multilingual guides with large rowboats and last about half an hour.


FR: A la limite nord du village de Saint-Léonard se trouve l'entrée du lac souterrain. Ce lac est le plus grand lac souterrain connu en Europe. Le lac est large d'environ 300 mètres à 20 mètres. La température de l'eau est de 11 degrés toute l'année.

Son existence était connue des habitants depuis des siècles, mais ce n'est qu'en 1943 qu'il a été exploré pour la première fois. A l'époque, le niveau de l'eau était presque au plafond de la grotte. Le grand tremblement de terre de janvier 1946 a fait descendre l'eau de quelques mètres et l'a stabilisée à son niveau actuel. Depuis 1949, des excursions en bateau sont proposées sur le lac. Entre 2000 et 2003, la grotte a dû être fermée et sécurisée car un bloc de roche s'était détaché du plafond.

Les excursions en bateau sont menées par des guides polyglottes à bord de grandes barques à rames et durent environ une demi-heure.


DE: Am Nordrand des Dorfes Saint-Léonard befindet sich der Eingang zum unteriridschen See. Dieser See ist der grösste bekannte unterirdische See Europas. Der See ist rund 300 Meter lang und etwa 20 Meter breit. Die Wassertemperatur liegt das ganze Jahr bei 11 Grad.

Seine Existenz war den Einheimischen scon seit Jahrhunderten bekannt, aber erst 1943 wurde sie das erste Mal erforscht. Damals lag der Wasserspiegel fast bei der Höhlendecke. Das grosse Erdbeben vom Januar 1946 führte dazu, dass das Wasser einige Meter sank und sich auf dem heutigen Niveau einpendelte. Seit 1949 werden Bootstouren auf dem See angeboten. Zwischen 2000 und 2003 musste die Höhle geschlossen und gesichert werden, da sich ein Felsblock aus der Decke gelöst hatte.

Die Bootstouren werden von mehrsprachigen Guides mit grossen Ruderbooten durchgeführt und dauern rund eine halbe Stunde.
Related Web Site: [Web Link]

Adult Ticket Price in local currency: 12

Period/Days/Hours of Operation:
From March 18th until November 1st every day from 10h00 to 17h00
July and August from 09h00 to 17h30


Food/Drink available on board?: no

Restroom facilities on board?: no

Address of the Ticket Counter:
Rue du Lac 21
Saint-Léonard, VS Switzerland
1958


Required Photos Will be Uploaded: yes

Protection from the elements on board: Not listed

Coordinates of the Ticket Counter: Not Listed

Visit Instructions:
Rule ammendment as of 03-July-2008, you must have ridden on the boat ride to log a visit. Non-compliant visits prior to this date may be grandfathered at the discretion of the waymyark owner.

Posting a photo of your experience is highly encouraged but not required. Please describe your experience and provide any tips for others who may be interested in following you.

Very brief logs with remarks such as "Visited" are discouraged. Such logs may be deleted.

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