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Saint-Léonard underground lake (French Lac souterrain de Saint-Léonard) is located at Saint Léonard in the canton of Valais, Switzerland.

Saint-Léonard underground lake
Lac souterrain de Saint-Léonard
Saint-Léonard underground lake
Saint-Léonard underground lake
Saint-Léonard underground lake
LocationSaint-Léonard, Valais
Coordinates46°15′23″N 7°25′32″E
Typeunderground lake
Basin countriesSwitzerland
Max. length260 m (850 ft)
Max. width29 m (95 ft)
Surface area6,000 m2 (65,000 sq ft)
Average depth4 m (13 ft)
Max. depth13 m (43 ft)
Surface elevation509 m (1,670 ft)

Geography


It is formed where a bed of Triassic gypsum, emplaced within impervious Carboniferous strata, has been dissolved by groundwater.[1] With a length of 300 and a width of 20 m it is the largest underground lake in Europe. It was discovered in 1943 by Jean-Jacques Pittard. Prior to 1946 the water-level was much higher, but an earthquake with a force of 5.6 on the Richter-scale opened additional fissures in the cave on January 25, 1946 made it more readily navigable. Its water is constantly at 11 °C (52 °F). The lake is accessible by the public since 1949. Visits are organized daily from March 15 to November 1, from 9 am to 5 pm. The visit is about half an hour long, and is held in English, French, German and Italian. Ticket-prices are 12 CHF for adults and 7 CHF for children.

Access to the lake was closed from 2000 to June 2003, whilst the stability of the site was improved by the addition of more than 5000 bolts driven into the ceiling.


References


  1. "Le Lac Souterrain". Lac Souterrain de St-Léonard. Retrieved 8 February 2017.




На других языках


- [en] Saint-Léonard underground lake

[fr] Lac souterrain de Saint-Léonard

Le lac souterrain de Saint-Léonard, situé à l'intérieur de la colline du Châtelard en Suisse, est le plus grand lac souterrain d'Europe, par ses 260 m de long sur 29 m de large. Son eau est constamment à 11 °C.

[it] Lago sotterraneo Saint Léonard

Il lago sotterraneo di Saint Léonard (in francese Lac souterrain de Saint-Léonard, in tedesco unterirdische See von St. Leonard) si trova in Svizzera, nel cantone Vallese tra Sion e Sierre nelle Alpi Pennine nel comune di Saint-Léonard, è stato scoperto nel 1943 e si trova a 509 m d'altezza. I suoi 300 m circa di lunghezza per 20 m di larghezza ne fanno il più grande lago sotterraneo finora scoperto in Europa e nel mondo. Il lago è abitato da trote iridee.

[ru] Сен-Леонар (озеро)

Сен-Леонар (фр. Lac souterrain de Saint-Léonard) — самое большое естественное подземное озеро в Европе. Расположено на территории коммуны Сен-Леонар, в швейцарском кантоне Вале. Площадь поверхности — 0,006 км². Высота над уровнем моря — 509 м.[источник не указан 1798 дней]



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