Black Sea
Black Sea is a sea between southeastern Europe and western Asia. It is bordered by Bulgaria, Romania, Ukraine, Russia, Georgia, and Turkey. It connects with the Sea of Marmara through the Bosporus and with the Mediterranean Sea through the Dardanelles and the Aegean Sea.
The Black Sea is one of the main maritime regions between the Balkans, Eastern Europe, the Caucasus, Anatolia, and the eastern Mediterranean. It receives several major rivers, including the Danube, the Dnieper, and the Dniester. The Danube Delta forms one of the main river mouths on its western side.
Geography
editThe Black Sea occupies a large basin at the southeastern edge of Europe. The sea stretches from the western coasts of Bulgaria and Romania to the Caucasus coast in the east. Its northern coast includes Ukraine and the Crimean Peninsula, while its southern coast follows northern Anatolia in Turkey.
The sea is connected to the smaller Sea of Azov through the Kerch Strait. Its only direct passage toward the Mediterranean system is through the Bosporus, the Sea of Marmara, and the Dardanelles. This route connects Black Sea ports with the Aegean Sea, Greece, the eastern Mediterranean, and wider maritime routes.
The Black Sea proper covers about 422,000 km². Its deepest part is more than 2,210 m below sea level.
Coasts and surrounding regions
editThe western Black Sea coast includes Bulgaria, Romania, and the lower Danube region. Romania's coastline gives the country maritime access and connects inland transport routes with Black Sea shipping. Constanța is the main Romanian port on the sea.
The northern coast is connected to Ukrainian ports, river mouths, agricultural regions, and the Crimean Peninsula. The eastern coast lies near the Caucasus and includes Georgian and Russian coastal areas. The southern coast follows Turkey's northern shoreline and connects Anatolia with Black Sea trade and naval routes.
The Black Sea region is often treated as a contact zone between Europe and Asia because it lies between the Balkans, the Pontic steppe, the Caucasus, and Anatolia.
Rivers and water conditions
editThe Danube is the largest river flowing into the Black Sea. It carries water from Central and Southeastern Europe and reaches the sea through the Danube Delta. Other major river systems connected to the sea include the Dnieper, Dniester, Southern Bug, Don, and Kuban.
The Black Sea has lower surface salinity than the open ocean because of river inflow and limited exchange with the Mediterranean. Its deeper waters contain little dissolved oxygen. This layered water structure affects marine life, decomposition, and the preservation of material on the seabed.
Transport
editThe Black Sea supports shipping, fishing, port work, naval movement, ferry routes, and coastal trade. Its ports connect inland Europe, the Balkans, the Caucasus, Anatolia, and the Mediterranean route through the Turkish Straits.
The Danube gives the Black Sea an inland connection to Central and Southeastern Europe. River shipping, rail transport, road freight, and port infrastructure make the lower Danube and Romanian coast important parts of the region's transport network.
Through the Bosporus and Dardanelles, Black Sea traffic reaches the Aegean Sea and the wider Mediterranean. This makes the sea important for movement between Romania, Bulgaria, Turkey, Greece, the Caucasus, and eastern Mediterranean routes.