a lake of Sweden, lying between N. Lat. 57° 30' and 58° 40'; E. Long. 14° and 15°; having the town of Linköping on the E., and that of Mariestad on the W., Orebro on the N., and Jönköping on the S. Its length is 80 miles, and its average breadth 10; its height above the sea 295 feet, and its depth in some places 70 fathoms. It is connected by the Gotha Canal with Lake Wener, and by the Motala Canal with the Baltic.