The deepest cave in the world is Krubera-Voronya. It is located in the Arabica Mountains in Abkhazia. Its depth is 2199 meters. The entrance to the cave is located at an altitude of about 2250 meters above sea level.

The shortest river in the world, the Reprua, flows near the cave. A powerful outlet of an underground karst river – which after 18 meters flows into the Black Sea.

Despite its “miniature” size, the Reprua provides water intake for the entire Gagra sity and is one of the coldest rivers on the Black Sea coast of the Caucasus. .