The North Caucasus, or Ciscaucasia, is a region in Europe governed by Russia. It constitutes the northern part of the wider Caucasus region, which forms the natural border between Eastern Europe and Western Asia. It is bordered by the Sea of Azov and Black Sea to the west, the Caspian Sea to the east, and the Caucasus Mountains to the south. The region shares land borders with the South Caucasus countries of Georgia and Azerbaijan. Located in the south of the region, Mount Elbrus is the tallest peak in Europe. Among its urban centres, Krasnodar is the most populous.