Lac des Brenets (Swiss name) or Lac de Chaillexon (French name) is a lake on the river Doubs on the border of Switzerland and France.

At the downstream end is a waterfall known as the Saut du Doubs.

A few hundred metres away, a bridge connects the French and Swiss sides of the lake.

The lake was effectively dried out completely during the European drought of 2022, causing all ship operations to cease.

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