9 days in Istanbul Turkey's and one of the most populous city in the world with round 20.000.000 inhabitants and Turkey's cultural and financial center. The city covers 25 districts of the Istanbul province. Located on the Bosphorus strait, encompasses the natural harbor known as the Golden Horn. It extends both on the European (Thrace) and on the Asian (Anatolia) side of the Bosphorus, and is thereby the only metropolis in the world which is situated on two continents.