orontsovskaya Cave System in the Khosta district of Sochi is the sixth in length in Russia. Together with the Labyrinth and Dolgaya caves and Kabany Proval they form a single system of caves with narrow passages filled with water. There are rivers, lakes and even waterfalls along this 11-kilometer-long karst solid mass.
The temperature inside the Vorontsovskaya Cave System and the entire underground complex is always about 12 ° C. Archaeologists have discovered here stone and bone tools, which are 15-20 thousand years old, and concluded that the caves served as a home for primitive people. The bones of cave bears were found in two rooms. The Small Circle with paths and lighting was opened here at a depth of 60 meters in 2000. It starts with the longest hall in the whole complex – Prometheus Grotto. The height of its walls is 20 meters, length - 120 meters. The walls of the grotto often collapsed, cracks and boulders are evidence of that. The Estradny hall makes tourists delightful because of numerous stalactites and stalagmites.