Germany, officially the Federal Republic of Germany, is a sovereign state in central-western Europe. It includes 16 constituent states, covers an area of 357,386 square kilometres (137,988 sq mi), and has a largely temperate seasonal climate. With nearly 83 million inhabitants, Germany is the most populous member state of the European Union. Germany's capital and largest metropolis is Berlin, while its largest conurbation is the Ruhr, with its main centres of Dortmund and Essen. The country's other major cities are Hamburg, Munich, Cologne, Frankfurt, Stuttgart, Düsseldorf, Leipzig, Bremen, Dresden, Hannover, and Nuremberg.