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 Keitele Lake Keitele Keitele is a rather large lake located in Central Finland. With the area of 493.59 km² it is the 9th largest lake in the country. The lake is divided into three regions, Ylä-, Keski-, and Ala-Keitele, of which Keski-Keitele is the largest. Water in the lake is clear and in excellent condition. The towns of Äänekoski and Viitasaari are located on the shores of Keitele. The northernmost part of the lake is called Ylä-Keitele. A big part of Ylä-Keitele belongs to Natura 2000 protection program due to its clear water and natural condition. A leading figure in modern