Lac de Grand-Lieu

Lac de Grand-Lieu
Location Saint-Philbert-de-Grand-Lieu, Loire-Atlantique
Coordinates 47°05′N 1°40′W / 47.083°N 1.667°WCoordinates: 47°05′N 1°40′W / 47.083°N 1.667°W
Type Natural
Primary inflows Boulogne, Ognon
Primary outflows Acheneau
Catchment area 700 km²
Basin countries France
Surface area 62.92 km² (Summer: 35Km²)
Average depth 1.6 m
Max. depth 4 m
Surface elevation 5 m
Islands 3

Lac de Grand-Lieu is a lake located to the south-west of Nantes, in the Loire-Atlantique, France, and almost entirely in Saint-Philbert-de-Grand-Lieu. At an elevation of 5 m, its surface area is 62.92 km², making it the largest lake in France in winter, but second after Lac du Bourget in summer.

The lake is classified as a Local Nature Reserve, and use of boats on the lake are prohibited for all but a small number of licensed professional fishermen.

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