Izmir, historically Smyrna, is the third most populous city of Turkey and the country's largest port after Istanbul. It is located in the Gulf of Izmir, by the Aegean Sea. It is the capital of Izmir Province. The city of Izmir is composed of 9 metropolitan districts. These are Balçova, Bornova, Buca, Çigli, Gaziemir, Güzelbahçe, Karsiyaka, Konak, and Narlidere. Each district, and generally the neighborhoods within it, possesses distinct features and a particular temperament. The 2000 population of this urban zone was 2,409,000 and the 2005 estimate is 3,500,000.