Lake, a lake of Upper Canada, lying midway between the Ottawa or Grand River and Georgian Bay, an inlet of Lake Huron. Its form is irregular; its length is about 48 miles, its greatest breadth 25, and its altitude 750 feet above the sea. Its principal affluent is the Sturgeon River from the N., which connects it with other lakes; and it discharges its waters by the French River into Lake Huron. The lake contains several islands, occupied by Indians; and abounds in large flocks of geese.