Lake M?laren, also called Lake M?lar, lake in eastern Sweden, located just west of Stockholm, which lies at the lake??V?????s junction with Salt Bay, an arm of the Baltic Sea. At one time Lake M?laren was a bay of the Baltic, and seagoing vessels using it were able to sail far into the interior of Sweden. Because of movements of Earth??V?????s crust, however, the rock barrier at the mouth of the bay had become so shallow by about 1200 that ships had to unload near the entrance, and the bay became a lake.