Savannah (/səˈvænə/) is the oldest city in the U.S. state of Georgia and is the county seat of Chatham County. Established in 1733 on the Savannah River, the city of Savannah became the British colonial capital of the Province of Georgia and later the first state capital of Georgia. A strategic port city in the American Revolution and during the American Civil War, Savannah is today an industrial center and an important Atlantic seaport. It is Georgia's fifth-largest city, with a 2017 estimated population of 146,444. The Savannah metropolitan area, Georgia's third largest, had an estimated population of 387,543 in 2017.