Lake Hévíz 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, which is available to bath ( in area). The flow of water is very strong and the water in the lake is completely replenished every 72 hours. The fauna and flora are unique in Lake Hévíz due to the temperature and chemical composition of the water, contains carbonic acid, calcium, magnesium, hydrogen carbonate, reduced sulfuric compounds as well as oxygen in solution. Several species so far can be found only in this lake.
Lake Esrum Lake Esrum Lake Esrum () is the largest lake in Denmark by water volume and the second-largest lake by surface area, after lake Arresø. It is situated in the central part of North Zealand (the northeastern region of Zealand), straddling the boundaries of the municipalities Hillerød, Fredensborg, Helsingør and Gribskov, some 40 kilometres north of Copenhagen. The lake covers 17 km, Its length from north to south is 8.4 km and its maximum depth is 22 m. Its principal drainage is Esrum Å, a 10-km stream which passes Esrum Watermill and the remains of Esrum Abbey on its way to