![The St-Léonard underground lake | Geological sites in Sierre, Salgesch and surroundings | Valais Switzerland The St-Léonard underground lake | Geological sites in Sierre, Salgesch and surroundings | Valais Switzerland](https://www.valais.ch/media/cache/single_image/a/activity-schluchten_grotten_st_leonard_3.jpg)
The St-Léonard underground lake | Geological sites in Sierre, Salgesch and surroundings | Valais Switzerland
![Switzerland Europe Saint-Léonard underground lake Indoor Inside landscape alpine alps mountain mountains Ca Stock Photo - Alamy Switzerland Europe Saint-Léonard underground lake Indoor Inside landscape alpine alps mountain mountains Ca Stock Photo - Alamy](https://c8.alamy.com/comp/BWRHR2/switzerland-europe-saint-lonard-underground-lake-indoor-inside-landscape-BWRHR2.jpg)
Switzerland Europe Saint-Léonard underground lake Indoor Inside landscape alpine alps mountain mountains Ca Stock Photo - Alamy
![World's Most Unique SUP Race? Results & Photos From The 'Bat Race' – Held On An Underground Lake In Switzerland – SUP Racer World's Most Unique SUP Race? Results & Photos From The 'Bat Race' – Held On An Underground Lake In Switzerland – SUP Racer](https://supracer.com/wp-content/uploads/2015/03/Bat-Race-8.jpg)
World's Most Unique SUP Race? Results & Photos From The 'Bat Race' – Held On An Underground Lake In Switzerland – SUP Racer
![ST-LÉONARD UNDERGROUND LAKE : Tourism and leisure Sierre Salgesch Val d'Anniviers Valais Switzerland ST-LÉONARD UNDERGROUND LAKE : Tourism and leisure Sierre Salgesch Val d'Anniviers Valais Switzerland](https://www.sierretourisme.ch/data/sierre/images/accroches/Activites/Lumiere.ch-Lacsouterrain1.jpg)
ST-LÉONARD UNDERGROUND LAKE : Tourism and leisure Sierre Salgesch Val d'Anniviers Valais Switzerland
Trevelyan May on X: "Saint-Léonard underground lake, the largest underground lake in Europe. Nice to be out of the heat!🇨🇭#rainbowtrout #Valais https://t.co/09FSyqvw2w" / X
![Lac Souterrain ST Leonard Underground lake | Lac de ST Leonard | Underground lake in Europe #travel - YouTube Lac Souterrain ST Leonard Underground lake | Lac de ST Leonard | Underground lake in Europe #travel - YouTube](https://i.ytimg.com/vi/Ui5l8bbeSok/sddefault.jpg)