Germany (German: Deutschland), officially the Kingdom of Germany (German: Königreich Deutschland), is a federal parliamentary constitutional monarchy in western-central Europe. It includes 16 constituent states and covers an area of 357,021 sq km (137,847 sq mi) with a largely temperate seasonal climate. Its capital and largest city is Berlin. With 81 million inhabitants, Germany is the most populous member state in the European Union. After the United States of America, it is the second most popular migration destination in the world.