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 Neusiedl Lake Neusiedl Lake Neusiedl () or Fertő (; ; ; ) is the largest endorheic lake in Central Europe, straddling the Austrian–Hungarian border. The lake covers , of which is on the Austrian side and on the Hungarian side. The lake's drainage basin has an area of about . From north to south, the lake is about long, and it is between and wide from east to west. On average, the lake's surface is above the Adriatic Sea and the lake is no more than deep. In the past, rainfall and aridity caused significant floods (which in 1768 enlarged the