Lac Souterrain St Léonard

Valais


Tiny St Léonard, 5.5km northeast of Sion, hides Europe’s biggest underground lake. To see the emerald waters shimmer, join a 30-minute guided tour by boat. Trains link Sion and St Léonard (Sfr3.60, three minutes, hourly).


Lonely Planet's must-see attractions

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