what state is istanbul in
), once known as Constantinople and Byzantium before that, is the most populous city in Turkey, and the country's economic, cultural, and historical center. Istanbul is a transcontinental city in Eurasia, straddling the Bosphorus strait between the Sea of Marmara and the Black Sea.resent day Istanbul is a flourishing city, with a constantly growing skyline which is one of the most prominent in all of Europe and Western Asia.