“Blue Lakes” located at an altitude of 809 m above sea level. In the lake is not no river flows and flows every day about eight thousand cubic meters of spring water , forming a separate Blue river. And in the winter and in the summer the water temperature constant in it - +10 °C. Visibility under water is practically independent of the weather , reaching 20-50 meters. Blue Water on the presence of hydrogen sulfide and refraction of light rays in a deep pool. The fish here is not found due to the presence of hydrogen sulfide. Uniqueness of the lake and that a small area of water surface , a little over two acres , it has a tremendous depth of 368 m , being the deepest in the Caucasus.