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 Balaton the late 19th century when landowners, ruined by "Phylloxera" attacking their grape vines, began building summer homes to rent out to the burgeoning middle classes. In Hungarian, the lake is known simply as "Balaton". It was called "lacus Pelsodis" or "Pelso" by the Romans. The name is Indo-European in origin (cf. Czech "pleso" ‘sinkhole, deep end of a lake’), later replaced by the Slavic *"bolto" (Czech "bláto", Slovak "blato", Polish "błoto") meaning 'mud, swamp' (from earlier Proto-Slavic "boltьno", , ). Slavic prince Pribina began to build in January 846 a fortress as his seat of power and several churches in