Budapest (UK: /ˌb(j)uːdəˈpɛst, ˌbʊd-, ˈb(j)uːdəpɛst, ˈbʊd-/, US: /ˈbuːdəpɛst, -pɛʃt, ˌbuːdəˈpɛʃt/; Hungarian pronunciation: [ˈbudɒpɛʃt]) is the capital and most populous city of Hungary. It is the ninth-largest city in the European Union by population within city limits and the second-largest city on the Danube river; the city has an estimated population of 1,752,286 over a land area of about 525 square kilometres (203 square miles). Budapest, which is both a city and county, forms the centre of the Budapest metropolitan area, which has an area of 7,626 square kilometres (2,944 square miles) and a population of 3,303,786; it is a primate city, constituting 33% of the population of Hungary.