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Mjøsa (myö´sä), largest lake of Norway, 141 sq mi (365 sq km), and 1,453 ft (443 m) deep, on the Oppland-Hedmark border, SE Norway. It is fed by the Lågen River and is drained by the Vorma River into the Glåma River. The lake is the center of a fertile agricultural region; grains are the chief crops. The region is also one of the most populated areas of Norway; Hamar, Gjøvik, and Lillehammer are the principal cities on the lake.