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Bosporus

American  
[bos-per-uhs] / ˈbɒs pər əs /
Also Bosphorus

noun

  1. a strait connecting the Black Sea and the Sea of Marmara. 18 miles (29 km) long.


Bosporus British  
/ ˈbɒspərəs, ˈbɒsfərəs /

noun

  1. a strait between European and Asian Turkey, linking the Black Sea and the Sea of Marmara

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Bosporus Cultural  
  1. Strait separating the European and Asian portions of Turkey. The Bosporus is a link between the Black Sea and the Mediterranean Sea.


Discover More

It is an important shipping route for Russia, whose northern routes are mostly blocked by ice in winter, and for other nations that border the Black Sea or use any of the many major rivers that flow into it.

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Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

The Bosporus, a major waterway in Turkey for commodities including Russian oil exported from the Black Sea, has been open for commercial traffic throughout most of the war in Ukraine.

From The Wall Street Journal • Nov. 28, 2025

Together with the Bosporus Strait, it serves as a vital route for commercial shipping between Europe and Asia.

From BBC • Aug. 8, 2025

On Saturday, authorities at the Bulgarian port of Varna did not confirm whether the Anna-Theresa will enter the port or will continue to the Bosporus Strait.

From Washington Times • Sep. 2, 2023

On Saturday, authorities at the Bulgarian port of Varna did not confirm whether the bulk carrier will enter the port or continue to the Bosporus Strait.

From Seattle Times • Sep. 2, 2023

It is an Eastern city of the sea, pierced by water at its heart, giving itself to the winds from Marmora, from the Golden Horn, from the Bosporus, from the Black Sea.

From The Near East Dalmatia, Greece and Constantinople by Hichens, Robert (Robert Smythe)

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