Turku is a city in Finland and the regional capital of Southwest Finland. It is located on the southwestern coast of the country at the mouth of the River Aura. The population of Turku is approximately 206,000, while the metropolitan area has a population of approximately 315,000. It is the 6th most populous municipality in Finland, and the third most populous urban area in the country after Helsinki and Tampere. Turku is Finland's oldest city.