Izmir, also once called Smyrna, is Turkey's third most populous city and the country's largest port after Istanbul. It is located along the outlying waters of the Gulf of Izmir, by the Aegean Sea. It is the seat of Izmir Province. The city of Izmir is composed of nine metropolitan districts (Balçova, Bornova, Buca, Çiğli, Gaziemir, Güzelbahçe, Karşıyaka, Konak and Narlıdere), each with its own distinct features and temperament. The total area of the nine districts is 855 km2 (330 sq mi) and together these districts constitute the area of Izmir Metropolitan Municipality headed by the mayor of Ýzmir. The total population of the metropolitan municipality was 2,649,582 by the end of 2007. Of these, 2,606,294 were living in central Izmir, consisting of the nine district centers of the metropolitan municipality.Modern Izmir also incorporates the nearby ancient cities of Ephesus, Pergamon, Sardis and Kilizman (Klazomenai), and centers of international tourism such as Kuşadası, Çeşme, Mordoðan and Foça.