The Caucasus, or Caucasia, is a transcontinental region between the Black Sea and the Caspian Sea, mainly comprising Armenia, Azerbaijan, Georgia, and parts of Southern Russia. The Caucasus Mountains, including the Greater Caucasus range, have historically been considered as a natural barrier between Eastern Europe and West Asia.
Mount Elbrus
Caucasus mountains in Svaneti, Georgia
Petroglyphs in Gobustan, Azerbaijan, a UNESCO World Heritage Site, dating back to 10,000 BC
Circassian strike on a Russian military fort in the Caucasus, 1840
The Black Sea is a marginal mediterranean sea lying between Europe and Asia, east of the Balkans, south of the East European Plain, west of the Caucasus, and north of Anatolia. It is bounded by Bulgaria, Georgia, Romania, Russia, Turkey, and Ukraine. The Black Sea is supplied by major rivers, principally the Danube, Dnieper and Dniester. Consequently, while six countries have a coastline on the sea, its drainage basin includes parts of 24 countries in Europe.
The estuary of the Veleka in the Black Sea. Longshore drift has deposited sediment along the shoreline which has led to the formation of a spit (Sinemorets, Bulgaria).
Black Sea coast of western Georgia, with the skyline of Batumi on the horizon
Swallow's Nest in Crimea
Coastline of Samsun in Turkey
