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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.
(also Mjösen), a lake in southeastern Norway; the largest lake in the country. Its length is about 100 km, and its area is 366 sq km. Depths reach 449 m. The lake is 124 m above sea level. The Lågen River (Gudbrandsdal-lagen) is the major river flowing into the lake. The Vorma River, a tributary of the Glåma River, flows out of Lake Mjösa. The lake is navigable. The cities of Hamar, Lillehammer, and Gj0vik are situated on the lake.