The Vorontsovskaya Cave System is a long chain of caves in the Khosta and Adler districts of Sochi, Russia. It is part of a range of Mesozoic limestones that runs parallel to the Black Sea coast for 400 km. and contains the Voronya Cave, the world's deepest cave. The Vorontsovskaya Cave was the first cave to be surveyed. It may be accessed through a dozen entrances dotting the slopes of the Kudepsta River valley, at heights ranging from 419 to 720 meters above sea level. The Prometheus Grotto, with a length of over 120 meters, is developed as a tourist destination. The cave takes its name from the nearest settlement, Vorontsovka. It is known to contain bones of cave bears and early humans.In the late 20th century, it was discovered that the Vorontsovskaya Cave is connected to the Labyrinth Cave, the Kabany Proval, and the Dolgaya Cave by a network of sumps, or siphons. Some cave chambers lie 240 meters higher than the others. This cave system has been mapped to about 12 kilometers. It is ranked as the longest in Krasnodar Krai and the 6th longest in the Russian Federation.
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