Published: April 17, 2010, 11:46 pm
Updated: May 21, 2013, 12:23 pm
Author: Peter Saundry
Author: Energy Information Administration
Contributing Author: Steve Baum
Topic Editor: Cutler J. Cleveland
Geography Of Energy
Oceans and seas
The Bosporus or Bosphorus (also known as the Istanbul Strait) is a strait connecting the Black Sea with the Sea of Marmara (and beyond it, through the Dardenelles to the Aegean Sea/Mediterranean Sea)
Together with the Dardanelles, the Bophosrus forms the Turkish Straits which separates the European part of Turkey from its Asian part.
The Bosporus is approximnately 19 miles (17 nautical miles/31 km) long. The strait is about 2.2 miles (3.5 km) wide at the northern entrance, narrows to minimum width of 750 meters between Anadoluhisar and Rumelihisar,south of the Fatih Sultan Mehmet Bridge. The depth varies from 36 to 124 meters in midstream. It is a former river valley that was drowned by the sea at the end of the Tertiary period.
The city of Istanbul straddles the Strait with a population of more than 13 million people.
Its strategic importance is high several international treaties have governed vessels using the waters. including the Montreux Convention Regarding the Regime of the Turkish Straits, signed in 1936. It is an important oil transit chokepoint.
GeographyThe Bosporus (Turkish: Boğaziçi) (41°07′10″ North, 29°04′31″ East) separates the European part (Rumeli) of Turkey from its Asian part (Anadolu).
It is crossed by two major bidges: The Bosporus Bridge and the Fatih Sultan Mehmet Bridge