Visit and enjoy Hévíz a natural and a famous thermal lake for bathing - swimming. It is the largest thermal lake in the world which is available to bath. The waters are reported to be beneficial for health, especially to patients suffering from rheumatic diseases and locomotor disorders, among others. Due to this, there is a thriving health tourism industry in the area. The curative effect of the lake was probably known to the ancient Romans. Coins found in the lake in the early 1980s also support this supposition. Discoveries from the age of Migration suggest that the migrant German and Slavic population used the lake as well. Written sources more than 400 years old originate from the age of Ottoman occupation.