Lac de Derborence is a mountain lake in the municipality of Conthey, Valais, Switzerland, located near the hamlet of Derborence. It was formed after rockfalls on 24 September 1714 and 23 June 1749. In 1749, an estimated 50 million m³ of rocks blocked the course of the Derbonne river and led to the formation of the lake.

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Lac de Derborence
View from the west side
Lac de Derborence Show map of Canton of Valais Lac de Derborence Show map of Canton of Vaud Lac de Derborence Show map of Switzerland Lac de Derborence Show map of Alps
Location	Conthey, Valais
Coordinates	46°16′44″N 7°13′2″E
Primary inflows	Derbonne
Basin countries	Switzerland
Surface area	4.4 ha (11 acres)
Surface elevation	1,449 m (4,754 ft)

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• List of mountain lakes of Switzerland

• Media related to Lac de Derborence at Wikimedia Commons
• Derborence in German, French and Italian in the online Historical Dictionary of Switzerland.
• http://www.derborence.ch

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