Lac de Grand-Lieu
| 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 |
| Type | Natural |
| Primary inflows | Boulogne, Ognon |
| Primary outflows | Acheneau |
| Catchment area | 700 km2 (270 mi2) |
| Basin countries | France |
| Surface area | 62.92 km2 (24.29 mi2) Summer: 35 km2 (14 mi2) |
| Average depth | 1.6 m (5.2 ft) |
| Max. depth | 4 m (13 ft) |
| Surface elevation | 5 m (16 ft) |
| Islands | 3 |
| Designated | 1 February 1995 |
| Reference no. | 714 |
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 mi2), 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.