The 6 valleys, named after the 6 rivers that cross them, each mountain hut lakes and waterfalls powered by sources, but especially by the mountain torrents to the melting of snow, which is very abundant at altitude.

Be careful, the mountain ecosystem is very fragile.

To preserve it, do not swim in the lakes. For your safety, also respect the signs installed on the banks of lakes and waterways, hydraulic structures and rising water levels can put you in danger. In Oisans, only the Lake of Buissonnière is suitable for swimming.

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