The lake's water source includes both cold and hot springs, with temperatures ranging from 23°C to 38°C depending on the season.
The red Indian water lily (Nymphaea rubra var. longiflora) is unique to this lake in Europe and has become a symbol of the town.
The water circulation is so efficient that the entire volume of the lake is replaced every three days.
The peat mud at the bottom of the lake contains both organic and inorganic substances, including sulfur and mild radioactive elements used in medical therapy.
The lake remains open for swimming throughout the winter due to the high temperature of the thermal springs.
Lake Hévíz is the world's largest biologically active, natural thermal lake, located in Hungary. The water temperature is maintained by a combination of cold and thermal springs deep within a 38-meter-deep crater. The lake's water is completely refreshed naturally every 72 hours. The ecosystem supports rare flora and fauna, including red Indian lotus flowers that were introduced to the lake in the late 19th century. Visitors bathe in the mineral-rich waters, which are purported to have therapeutic effects on musculoskeletal conditions. The bottom of the lake is covered in a thick layer of medicinal peat mud, which is extracted for specialized spa treatments. The site has served as a documented health destination since the late 18th century.
The wooden bathhouse pavilions located at the center of the lake provide the most iconic perspective of the thermal mist.
Use the provided floating noodles for stability, as the sulfurous, dense water makes traditional swimming unnecessary and tiring.
Limit continuous soaking time to 20-30 minute intervals to avoid overstressing your cardiovascular system.
Wear old swimwear, as the minerals and mud in the water can permanently discolor white or light-colored fabrics.
Do not attempt to swim for extended periods without a floating aid, and avoid wearing jewelry, as the sulfur content will cause silver and some other metals to tarnish quickly.
Swimmers are required to use the provided foam neck-floats to prevent vertical treading; nudity is prohibited; quiet demeanor is expected in the bath area.
