Germany, formally the Federal Republic of Germany, is a nation in Central Europe with a population of over 83 million people. In terms of population, it is the second-most populated nation in Europe after Russia, and the most populous country in the European Union. A country with a land area of 137,847 square miles, Germany is bordered to the north by the Baltic and North Seas and to the south by the Alps. It has a population of more than 83 million people spread throughout its 16 component states. Its northern border is with Denmark, while its eastern border is with Poland and the Czech Republic. Its southern border is with Austria and Switzerland, and its western border is with France, Luxembourg, Belgium, and the Netherlands. Berlin is the nation's capital and biggest city, while Frankfurt serves as its financial centre; the Ruhr is the country's largest metropolitan region, with a population of over 10 million people.