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 1.765 million residents within a greater metropolitan area of 3.101 million residents, which makes Warsaw the 8th most-populous capital city in the European Union. The city limits cover 516.9 square kilometres (199.6 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. With a GDP PPP of $230 billion and $43,200 per capita, it is one of the wealthiest capital cities in Central and Eastern Europe. Moreover, its historical Old Town was designated a UNESCO World Heritage Site.