Lake Hévíz is situated on a 60.5-acre nature conservation area, from which the lake itself takes 4.44 acres. In contrast to other hot-water lakes around the world, which are mostly located on volcanic clay or rock soils, Lake Hévíz is a turf-based spring lake. In the huge spring cave discovered in 1975, the karst waters of several cold- and hot-water springs are mixed together. From here, the mixed medicinal water flows through a narrow corridor, and then reaches the lake at a constant temperature of 38.5 °C.

Due to its situation, the spring cave can only be visited subject to strict regulations, with the approval of the operator and the competent nature conservation authority, in compliance with the rules of cave diving.

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31 000 HUF / person / 2 nights
25 800 HUF / person / 2 nights