With a population of over 18.8 millions Istanbul is a Megalopolis and the main financial, shopping and cultural center of Turkey. Spread over 27 of the 39 districts of the province with the same name as one of the largest metropolises in the world. The
economic capital of Turkey and the prefecture of the province with the same name. The European side is located in the historical region of Thrace and Asia in Anatolia. Officially called Istanbul on 28 March 1928. Along with Athens and Rome, Constantinople's,
that is Istanbul's most venerable ranks among the capitals of Europe.