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Black Sea countries -What is Black Sea famous for? 

Black Sea 

The Black Sea.

 The Black Sea, roughly oval in shape, occupies a vast basin strategically located on Europes southeast edge, but connected with distant waters in the Atlantic Ocean by the Bosporus (which rises out of the south-western corner of the sea), the Sea of Marmara, the Dardanelles, the Aegean and Mediterranean seas. 

The Black Sea is a landlocked sea located between southeast Europe and the Anatolian Peninsula (Turkey) and is eventually connected to the Atlantic Ocean via the Mediterranean and Aegean Seas, as well as several straits.

The Black Sea basin is connected to the Mediterranean Sea by the Turkish Straits System (TSS) to its southwest, comprising the Bosporus and Dardanelles Straits, as well as the Sea of Marmara. 

The Bosporus strait links the Black Sea with the Sea of Marmara, while the longer, island-bound strait of the Dardanelles links it with the Mediterranean region of the Aegean.

 The Turkish Straits connect The Black Sea to The Aegean and consist of the Bosporus strait, Sea of Azov, and Dardanelles.

To the north, The Strait of Kerch links the Black Sea to the Sea of Azov (which borders eastern Ukraine and Russian Rostov Oblast, as well as some regions described above), which may or may not be considered a part of the Black Sea, and to the south, the Black Sea is connected to the Sea of Marmara (and to the Mediterranean) via The Bosphorus. 

The Black Sea is the most isolated from the worlds oceans: connected with the oceans by the Mediterranean through Istanbul, Canakkale (Turkish strait) and Gibraltar, and to the Sea of Azov to the northeast via the Strait of Kerch, and to the Sea of Azov via the Strait of Kerch.

Why Arabian Sea is famous? From Here 

 Although Crimea and Russias southern port city of Novorossiysk give Russian naval vessels and oil tankers access to ports in the warm seas, all ships entering or leaving the Black Sea have to pass through Turkish-controlled Bosphorus and the Dardanelles, the two strategic and critical transit routes between the Black Sea and the Mediterranean.

 The Black Sea is bounded by Ukraine to the north, Russia to the northeast, Georgia to the east, Turkey to the south, Bulgaria and Romania to the west.

It is bound westwards by the Balkan peninsula of Southeast Europe, to the east by the Caucasus, northwards by East European plains, and southwards by Anatolia in western Asia.

 The Black Sea is a mid-sized Mediterranean Sea in the Atlantic Ocean, lying between Europe and Asia; to the east by the Balkan Peninsula (Southeast Europe), south by East European Plains in Eastern Europe, to the west by the Caucasus, and north by Anatolia of Western Asia. 

Russia, acutely aware of the possibility that instability might spill over from the Middle East to Russia--particularly the North Caucasus--also views the Black Sea as a critical security buffer, protecting Russias homeland from potential violence from farther south.