Lake Hévíz is Europe’s largest thermal lake and one of the largest swimmable thermal lakes in the world. The lake is fed from both cold and hot underground springs, the temperature evens out at a perfect 90°F, so you could really spend all day floating around amongst the water lilies or sinking up to your thighs in the therapeutic peaty mud along the lake’s edges. Spa Hévíz opens the lake to visitors and retains all of its 18th century charm throughout its thoroughly modernized facilities including nine indoor pools.


  1. The peat-bottomed lake is fed by cold and warm water rich in mineral content originating in springs located in a 40 m deep cave.
  2. The temperature of the lake varies between 23-25 °C in winter and 33-36 °C in summer.
  3. The flora and fauna are unique in Lake Hévíz due to the temperature and chemical composition of the water, which contains carbonic acid, calcium, magnesium, acid carbonate, reduced sulfuric compounds as well as oxygen in solution.

  4. The lake’s curative effect is believed to be a product of the unique blend of organic and inorganic materials found in the waters.
  5. Micromonospora heviziensis, a bacteria that is a very powerful protein and cellulose decomposer, can only be found here in the entire world.
  6. The two thermophile blue green alga species, Lake Heviz is the only Hungarian habitat.

What To See

  • Biggest Spa: Just a few miles from the western edge of Lake Balaton, Zalakaros is another town which improved its luck when valuable mineral water was accidentally struck.
  • Turkish Relics: Török Fürdő is the last surviving Turkish bath in the Hungarian countryside, and is not far from the northernmost remaining minaret erected by the Ottomans.
  • Eger’s Salt Hill: The prominent of the region’s thermal spas is Egerszalók. The steaming medicinal water comes from below the volcanic Mátra Mountains and cascades down a unique series of terraced limestone formations lined with travertine, named “Salt Hill” due to its appearance.
  • Cave Bathing: Located in the northwestern part of the country, this is Europe’s only thermal cave bath. Outside there are several pools and an adventure area for kids.

Hévíz is rich in natural healing elements. The destination’s thermal mineral water, lake mud, aromatic air and a warm, year-round climate form the basis of treatments addressing a long list of conditions:

  • Rheumatic complaints
  • Nervous system and circulation disorders
  • Musculoskeletal conditions, plus rehabilitation and preventive programmes
  • Stomach and digestive ailments
  • Gynaecological conditions
  • Skin issues

The lake of Hévíz is the biggest biologically active, natural medicinal water in the world. Its temperature is affected by the combination of cold and hot spring waters coming from underground. The medicinal water breaks out from the spring cave on the surface at the rate of approx. 410 litres per second and with a temperature of 40°C. According to that delivery, the water in the lake changes every three and a half days and keeps uniformly clean.


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