Lake Hévíz among Rotatorias as well ("Epiphanes brachionus" var. "Spinosus", "Lecane inermis"), which are only present in warm waters. Jenő Ponyi has described the lake's primitive crustaceans in detail. Also a unique "Hydracarina acarus" is said to have found its habitat outside the fence surrounding the lake. The waters are reported to be beneficial to patients suffering from rheumatic diseases and locomotor disorders, among others. There is a thriving health tourism industry in the area. Lake Hévíz Lake Hévíz is located in Hévíz, Hungary, near the western end of Lake Balaton, from Keszthely. It is the largest thermal lake in the world,
Lake Constance the region and during which Austrian and French flotillas operated on Lake Constance, there was a reorganisation of state relationships. 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