Lake Constance is the third largest freshwater lake in Central Europe covering an area of about 565 square kilometres bordering Germany, Switzerland and Austria. 2.2 million people live and work in the Lake Constance region. 4.5 million people drink Lake Constance water, and over 50,000 boats are registered here. Despite those human activities, Lake Constance has preserved a natural landscape with rich biological diversity. About 200,000 water birds rest or hibernate in the region and 26 different species live there.