The Black Sea (known as the Euxine Sea in antiquity) is an inland sea between southeastern Europe and Asia Minor. It is connected to the Mediterranean Sea by the Bosporus and the Sea of Marmara, and to the Sea of Azov by the Strait of Kerch. There is a net inflow of seawater through the Bosporus, 200 km³ per year. There is an inflow of freshwater from the surrounding areas, especially central and middle-eastern Europe, totalling 320 km³ per year. The most important river entering the Black Sea is the Danube. The Black Sea has an area of 422,000 km² and a maximum depth of 2210 m. Countries bordering on the Black Sea are Turkey, Bulgaria, Romania, Ukraine, Russia, Georgia. The Crimea is an Autonomous Republic of Ukraine. Important cities along the coast include: Istanbul (formerly Constantinople and Byzantium), Burgas, Varna, Constan?a, Yalta, Odessa, Sevastopol, Kerch, Novorossiysk, Sochi, Sukhumi, Batumi, Trabzon, Samsun.