Samara region, village of Sernovodsk. On the territory of the village there is a sanatorium built here more than a century ago. The site for construction was chosen because of the lake, whose water is rich in hydrogen sulfide and other chemical elements. The water in it does not freeze even in severe frosts. But the smell is appropriate. Water enters the lake itself from springs; the total volume of inflow is about 6 million liters per day. The mud from this lake is especially valued; on the territory of the sanatorium there are so-called mud baths.
The water in the lake has a green color, the saturation of which depends on the lighting.
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