Lac de Grand-Lieu

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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°W / 47.083; -1.667
Type	Natural
Primary inflows	Boulogne, Ognon
Primary outflows	Acheneau
Catchment area	700 km2 (270 sq mi)
Basin countries	France
Surface area	62.92 km2 (24.29 sq mi) Summer: 35 km2 (14 sq mi)
Average depth	1.6 m (5.2 ft)
Max. depth	4 m (13 ft)
Surface elevation	5 m (16 ft)
Islands	3
Ramsar Wetland
Designated	1 February 1995
Reference no.	714[1]

Lac de Grand-Lieu (French: [lak də gʁɑ̃.ljø]) is a lake located to the southwest of Nantes, in the Loire-Atlantique, France, and almost entirely in Saint-Philbert-de-Grand-Lieu. At an elevation of 5 m (16 ft), its surface area is 62.92 km² (24.29 sq mi), 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.