Warsa Polish: Warszawa,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 and its population is officially estimated at 1.8 million residents within a greater metropolitan area of 3.1 million residents, which makes Warsaw the 7th most-populous capital city in the European Union. The city area measures 517 km2 200 sq mi and comprises 18 boroughs, while the metropolitan area covers 6,100 km2 2,355 sq mi.