Lake Constance is located in the foothills of the Alps. The shore length of both main lakes is long. Of this, are located in Germany (Baden-Württemberg , Bavaria ), run through Austria and through Switzerland. If the upper and lower lakes are combined, Lake Constance has a total area of , the third largest lake in Central Europe by area after Lake Balaton () and Lake Geneva (). It is also the second largest by water volume () after Lake Geneva () and extends for over between Bregenz and Stein am Rhein. Its catchment area is around , and reaching as far south as Lago di Lei in Italy.