
1) Istanbul is on it 2) Istanbul strait 3) Istanbul waterfront 4) Sound 5) Strait 6) Turkish strait
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https://www.crosswordclues.com/clue/bosporus

1) Strait
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https://www.crosswordclues.com/clue/bosporus

• (n.) A strait or narrow sea between two seas, or a lake and a seas; as, the Bosporus (formerly the Thracian Bosporus) or Strait of Constantinople, between the Black Sea and Sea of Marmora; the Cimmerian Bosporus, between the Black Sea and Sea of Azof.
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http://thinkexist.com/dictionary/meaning/bosporus/

strait (boaz, `throat`) uniting the Black Sea and the Sea of Marmara and separating parts of Asian Turkey (Anatolia) from European Turkey.[3 related articles]
Found on
http://www.britannica.com/eb/a-z/b/97
Bos'po·rus (bŏs'po*rŭs)
noun [ Latin ] A strait or narrow sea between two seas, or a lake and a seas; as, the
Bosporus (formerly the Thracian Bosporus) or Strait of Constantinople, between the Black Sea and Sea of Marmora; the Cimmerian
Bosporus , between the Black Sea and Sea...
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http://www.encyclo.co.uk/webster/B/82

[
n] - a strait connecting the Mediterranean and the Black Sea
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http://www.webdictionary.co.uk/definition.php?query=Bosporus

Bosphorus, Bosporus 1. A narrow strait separating European and Asian Turkey and joining the Black Sea with the Sea of Marmara. It has been an important trade route since ancient times. 2. The name, meaning 'ox passage', is associated with a Greek myth about Io's travels after Zeus turned her into an ox for her protection.
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http://www.wordinfo.info/words/index/info/view_unit/316/
noun a strait connecting the Mediterranean and the Black Sea; separates the European and Asian parts of Turkey; an important shipping route
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https://www.encyclo.co.uk/local/20974

Strait 27 km/17 mi long, joining the Black Sea with the Sea of Marmara and forming part of the water division between Europe and Asia; its name may be derived from the Greek legend of Io. Istanbul stands on its west side, which is lined with villas and old castles. The Bosporus Bridge (1973), 1,621 m/5,320 ft, links Istanbul and Anatoli...
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https://www.encyclo.co.uk/local/21221

a strait connecting the Black Sea and the Sea of Marmara. 18 mi. (29 km) long.
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https://www.infoplease.com/dictionary/bosporus
No exact match found.