Lac de Lessy is a lake at Le Petit-Bornand-les-Glières in the Haute-Savoie, France.
| Lac de Lessy | |
|---|---|
 | |
  Lac de Lessy | |
| Location | Haute-Savoie |
| Coordinates | 45°59′16″N 6°26′17″E / 45.98778°N 6.43806°E |
| Basin countries | France |
| Surface area | 7.1 ha (18 acres) |
| Max. depth | 1.7 m (5 ft 7 in) |
| Residence time | 600 days |
| Surface elevation | 1,730 m (5,680 ft) |
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