Turkish Straits

Turkish Straits is located in Europe
A map depicting the locations of the Straits, with the Bosphorus in red, and the Dardanelles in yellow. The sovereign national territory of Turkey is highlighted in green.
The Bosphorus (red), the Dardanelles (yellow), and the Sea of Marmara in between, are known collectively as the Turkish Straits
Satellite image of the Bosphorus, taken from the International Space Station in April 2004. The body of water at the top is the Black Sea, the one at the bottom is the Marmara Sea, and the Bosphorus is the winding vertical waterway that connects the two. The western banks of the Bosphorus constitute the geographic starting point of the European continent, while the banks to the east are the geographic beginnings of the continent of Asia. The city of Istanbul is visible along both banks.
View of the Dardanelles, taken from the Landsat 7 satellite in September 2006. The body of water at the upper left is the Aegean Sea, while the one on the upper right is the Sea of Marmara. The long, narrow upper peninsula is Gallipoli (Turkish: Gelibolu), and constitutes the banks of the continent of Europe, while the lower peninsula is Troad (Turkish: Biga) and constitutes the banks of the continent of Asia. The Dardanelles is the tapered waterway running diagonally between the two peninsulas, from the northeast to the southwest. The city of Çanakkale is visible along the shores of the lower peninsula, centered at the only point where a sharp outcropping juts into the otherwise-linear Dardanelles.

The Turkish Straits (Turkish: Türk Boğazları) are two internationally significant waterways in northwestern Turkey. The straits create a series of international passages that connect the Aegean and Mediterranean seas to the Black Sea. They consist of the Dardanelles and the Bosphorus. The straits are on opposite ends of the Sea of Marmara. The straits and the Sea of Marmara are part of the sovereign sea territory of Turkey and subject to the regime of internal waters.

Located in the western part of the landmass of Eurasia, the Straits are conventionally considered the boundary between the continents of Europe and Asia, as well as the dividing line between European Turkey and Asian Turkey. Owing to their strategic importance in international commerce, politics, and warfare, the Straits have played a significant role in European and world history. Since 1936, they have been governed in accordance with the Montreux Convention.


As maritime waterways, the Turkish Straits connect various seas along the Eastern Mediterranean, the Balkans, the Near East, and Western Eurasia. Specifically, the Straits allows maritime connections from the Black Sea all the way to the Aegean and Mediterranean Seas, the Atlantic Ocean via Gibraltar, and the Indian Ocean through the Suez Canal, making them crucial international waterways, in particular for the passage of goods coming in from Russia.

The Turkish Straits are made up of the following waterways;

  • The Bosphorus (also spelled Bosporus; Turkish: Boğaziçi or İstanbul Boğazı, "Istanbul Strait"), about 30 kilometers (19 mi) long and only 700 meters (2,300 ft) wide, connects the Sea of Marmara with the Black Sea in the north. It runs through the city of Istanbul, making it a city located on two continents. It is crossed by three suspension bridges (the Bosphorus Bridge, the Fatih Sultan Mehmet Bridge and the Yavuz Sultan Selim Bridge), and two underwater tunnels (the Marmaray rail tunnel and the Eurasia road tunnel). There are plans for further crossings being debated at various stages.
  • The Dardanelles (Turkish: Çanakkale Boğazı, "Çanakkale Strait"), 68 km (42 mi) long and 1.2 km (0.75 mi) wide, connects the Sea of Marmara with the Mediterranean in the southwest, near the city of Çanakkale. In classical antiquity, the Dardanelles strait was known as the Hellespont. The strait and the Gallipoli (Gelibolu) peninsula on its western shoreline were the scene of the Battle of Gallipoli during the First World War. The Çanakkale 1915 Bridge, currently under construction and set to open in 2022, will be the first crossing of the strait.

Developments of economic activities threaten marine ecosystem including endemic dolphins and harbour porpoises.[1]

Straits Question

The Straits have had major maritime strategic importance at least since Bronze-age armies fought the Trojan War near the Aegean entrance, and the narrow crossings between Asia and Europe have provided migration and invasion routes (for Persians, Galatians, and Turks, for example) for even longer. In the declining days of the Ottoman Empire, the "Straits Question" involved the diplomats of Europe and the Ottomans.

By the terms of the London Straits Convention concluded on July 13, 1841 between the Great Powers of Europe Russia, the United Kingdom, France, Austria and Prussia, the "ancient rule" of the Ottoman Empire was re-established by closing the Turkish straits to all warships whatsoever, barring those of the Ottoman Sultan's allies during wartime.[2] This treaty became one in a series dealing with access to the Bosphorus, the Sea of Marmara, and the Dardanelles. It evolved from the secret 1833 Treaty of Hünkâr İskelesi (Unkiar Skelessi), in which the Ottoman Empire guaranteed exclusive use of the Straits to "Black Sea Powers" (i.e., Ottoman Empire and Russian Empire) warships in the case of a general war.

The Straits became especially important in the course of World War I (1914-1918) as a potential link between the Entente powers' Eastern and Western Fronts. Anglo-French naval forces failed to take control of the Dardanelles (February - March 1915), but in the secret Straits Agreement diplomacy of March-April 1915, the members of the Triple Entente agreed – in the event of victory in World War I – to cede Ottoman territory controlling and overlooking the Straits to the Russian Empire. Anglo-French troops then launched the Gallipoli campaign, an ultimately unsuccessful operation to take control of the Straits following amphibious landings on the Gallipoli Peninsula (April 1915 to January 1916). The revolutions in Petrograd in 1917 ultimately stalled Russia's own plans to seize the Straits.[3][4]

The modern treaty controlling access is the 1936 Montreux Convention Regarding the Regime of the Straits, which remains in force as of 2022. This Convention gives the Republic of Turkey control over warships entering the straits but guarantees the free passage of civilian vessels in peacetime.

See also


  1. ^ Khan S.. 2013. An Economic Boom in Turkey Takes a Toll on Marine Life. Yale Environment 360. Retrieved on September 06, 2017
  2. ^ Rozakis & Stagos 1987, pp. 24–25.
  3. ^ Windchy, Eugene G. (2014). "World War I (1917 to 1918)". Twelve American Wars: Nine of Them Avoidable (2 ed.) (published 2015). p. 283. ISBN 9781491730546. Retrieved 14 August 2020. [...] Saz[o]nov made plans for a seizure of the Turkish straits.
  4. ^ McMeekin, Sean (2013). July 1914: Countdown to War. London: Icon Books Ltd. ISBN 9781848316096. Retrieved 14 August 2020. [...] Sazonov, Sukhomlinov, and Grigorevich had drawn up a detailed plan for readying Russia to seize Constantinople and the Ottoman Straits in case of war. The plan covered [...] the acceleration of the mobilisation timetable, which would see the first day troops could be put ashore at the Bosporus speeded up from Mobilisation Day (M) + 10 to M + 5 [...]. [...] After learning the news from Sarajevo, Sazonov [...] wanted to know whether, in accordance with measures ordered in February [1914], the first Russian troops would now be able to land in the Bosphorus within 'four or five days' of mobilisation. [...] Sazonov was preparing for a European war, in which Russia's key strategic objective was to seize Constantinople and the Straits.


  • Gerolymatos, André (2014). "The Turkish Straits: History, Politics and Strategic Dilemmas". Ocean Yearbook. 28: 58–79. doi:10.1163/22116001-02801003.
  • Rozakis, Christos L.; Stagos, Petros N. (1987). The Turkish Straits. Martinus Nijhoff Publishers. ISBN 90-247-3464-9.

Coordinates:40°43′21″N 28°13′29″E / 40.7225°N 28.2247°E / 40.7225; 28.2247

Media files used on this page

Yellow pog.svg
Shiny yellow button/marker widget. Used to mark the location on a map.
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Author/Creator: User:Interiot, Licence: CC BY-SA 2.5
Disambiguation for Turkish Straits.
  Dardanelles Strait
Istanbul and Bosporus big.jpg
Istanbul, Turkey: The Crossroads of Europe and Asia

This digital camera image was taken by the crew of the International Space Station on April 16, 2004. When this image was taken, strong currents carried turbid coastal waters from the Black Sea through the Strait and into the Sea of Marmara. The rugged uplands to the north of the city are forested and contain vital reservoirs. Note Ataturk airport southwest of the city near the bottom of the image, the picturesque Prince Islands in the Sea of Marmara, and the sinuous waterway and harbor on the western shore known as the Golden Horn.

Astronaut photograph ISS008-E-21752 was taken with a Kodak DCS760 digital camera equipped with an 200-mm lens, and is provided by the Earth Observations Laboratory, Johnson Space Center. The International Space Station Program supports the laboratory to help astronauts take pictures of Earth that will be of the greatest value to scientists and the public, and to make those images freely available on the Internet. Additional images taken by astronauts and cosmonauts can be viewed at the NASA/JSC Gateway to Astronaut Photography of Earth.
Locator map of Turkey.svg
Author/Creator: of derivative work: Nordwestern, Licence: CC BY-SA 4.0
Locator map of Turkey
Dardanelles landsat.jpg
Landsat 7 image of the Dardanelles and Gallipoli Peninsula, Turkey.