Warsaw, officially the Capital City of Warsaw, is the capital and largest city of Poland. The metropolis stands on the River Vistula in east-central Poland. Its population is officially estimated at 1.86 million residents within a greater metropolitan area of 3.27 million residents, which makes Warsaw the 7th most-populous city in the European Union. The city area measures 517 km² and comprises 18 districts, while the metropolitan area covers 6,100 km². Warsaw is classified as an alpha global city, a major cultural, political and economic hub, and the country's seat of government. It is also the capital of the Masovian Voivodeship.