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The largest underground lake in Europe

The largest underground lake in Europe is in the southern Swiss canton of Valais in St-Léonard, not far from the cantonal capital, Sion. The lake attracts over 100,000 visitors a year.

On its 60th anniversary in 2009, Julie Hunt went to investigate what makes it special.(Julie Hunt, swissinfo.ch)

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SWI swissinfo.ch - a branch of Swiss Broadcasting Corporation SRG SSR

SWI swissinfo.ch - a branch of Swiss Broadcasting Corporation SRG SSR