Lake, south-central Quebec, Canada.
A shallow lake, it has an area of 387 sq mi (1,003 sq km) and discharges into the Saguenay River . In the 20th century logging operations on its feeder streams led to the establishment of large paper mills on the lake. Since 1926 the lake's seasonal fluctuations have been controlled by two hydroelectric dams. It is a tourist resort centre famous for its salmon fishing.