Warsaw is the capital and largest city of Poland. The metropolis stands on the Vistula River 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 517.24 square kilometres (199.71 sq mi), while the metropolitan area covers 6,100.43 square kilometres (2,355.39 sq mi). Warsaw is an alpha-global city, a major international tourist destination, and a significant cultural, political, and economic hub. Its historical Old Town was designated a UNESCO World Heritage Site.