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Lake Razval is a mineral, or brine, lake. Its water is a saturated salt solution—brine. The lake formed in 1906 on the site of a salt quarry, and its shores were originally composed of pure table salt.
Lake Razval is the most famous, largest, and saltiest lake at the resort. The water's mineral content is higher than that of the Dead Sea, reaching 320–340 g/l. The lake covers an area of 9 hectares and reaches a depth of 18 meters.
In summer, the water warms up to 26–28 degrees Celsius at the surface, but at a depth of 3 meters, the temperature drops sharply, and below 5 meters, it becomes subzero, regardless of the time of year. A similar phenomenon has not been recorded anywhere else in Russia and is explained, like other features of the lake, by its high salt content.
Ice doesn't form on the lake even in the most severe frosts, and the water is so dense that it literally pushes swimmers to the surface. The extremely salty water contains no plants or animals, yet it has a strengthening and healing effect on the human body due to its high bromine and sodium chloride content.
The lake's water is successfully used to treat the following conditions:
- Skin (eczema and psoriasis).
- Musculoskeletal system (osteochondrosis, polyarthritis, rheumatism).
- Respiratory system (bronchial asthma, etc.).
- Internal organs.
