Skating on Lac de Joux, Switzerland. 滑冰在Lac de Joux，瑞士。

REUTERS / Valentin Flauraud

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the lake is among the largest natural ice rinks of Europe.
Eyewitness: Skating on Lac de Joux | World news | guardian.co.uk
http://www.guardian.co.uk/world/picture/2011/jan/31/switzerland-switzerland 
Lac de Joux - Wikipedia, the free encyclopedia
http://en.wikipedia.org/wiki/Lac_de_Joux
Where in the World? (19th Edition)
http://www.ibtimes.com/articles/214579/20110915/where-in-the-world-photo-trivia.htm 
List of lakes in Switzerland - Wikipedia, the free encyclopedia
http://en.wikipedia.org/wiki/List_of_lakes_in_Switzerland