The waterside city of Jonkoping stands at the southern end of Lake Vattern in southern Sweden. The lake is the second biggest in the country and the sixth biggest in Europe, covering more than 7 square miles with a shoreline about 2 miles long. The lake is a Swedish tourist attraction and its water is renowned for being so clean it can be drunk without treatment. Visitors who hire a car in Jonkoping can visit plenty of attractions on the surrounding countryside, like the ancient Viking burial grounds at Visingsø, the scenic Domne River valley and Visingborg castle.