It has the world's second largest natural thermal lake with a surface area of 47,500 square metres. The water temperature is 35-38 degrees centigrade. At the surface it is 28-32 degrees, with winter temperatures not below 26-29. The daily water output is 80 million litres. The full amount of water is replaced in two days. The springs break out of a Triassic dolomite layer in a cave, 18 metres in diameter. The depth of the water at the source is 38 metres.
The lake is also famous for the water-lilies introduced early this century by Sandor Lovassy.
The medicinal water is beneficial for joint ailments, rheumatism, locomotor disorders, arthritis, spinal complaints, ankylosing spondylitis, motor impairment as a result of neuroses, neuralgia, and gynaecological diseases.
Gyorgy Festetics had the first bathing houses built in 1795. Today, the town abounds in hospitals, senator, and hotels for those who come to take the waters. There are more and more visitors each year.
Two of its statues are worth mentioning -- one is of Sandor Lovassy, who introduced the water-lilies, and the other is of Jozsef Babocsay, a medical doctor, who wrote the first detailed description of Heviz in 1795.
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