Lac des Autannes
Reservoir in Grimentz, Valais
46°07′58″N 7°32′34″E / 46.1328°N 7.5428°E / 46.1328; 7.5428![Map](https://maps.wikimedia.org/img/osm-intl,16,a,a,270x200.png?lang=en&domain=en.wikipedia.org&title=Lac_des_Autannes&revid=1086726572&groups=_406227c724b6948e381a0e40ce55229dfb323597)
Lac des Autannes is a lake above Grimentz in the canton of Valais, Switzerland. The reservoir has a surface area of 4.5 hectares (11 acres). It is located at an elevation of 2,686 metres (8,812 ft).
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