Germany (Listeni /ˈdʒɜrməni/), officially the Federal Republic of Germany (German: Bundesrepublik Deutschland, pronounced [ˈbʊndəsʁepuˌbliːk ˈdɔʏtʃlant] ( listen)),[4][note 1] is a country in Western Europe. It is bordered to the north by the North Sea, Denmark, and the Baltic Sea; to the east by Poland and the Czech Republic; to the south by Austria and Switzerland; and to the west by France, Luxembourg, Belgium, and the Netherlands. The territory of Germany covers an area of 357,021 km2 and is influenced by a temperate seasonal climate. With 81.8 million inhabitants, it is the most populous member state of the European Union,[5] and home to the third-largest number of international migrants worldwide.[6] A region named Germania, inhabited by several Germanic peoples, was documented before AD 100. Beginning in the 10th century, German territories formed a central part of the Holy Roman Empire, which lasted until 1806. During the 16th century, northern German regions became the centre of the Protestant Reformation while southern and western parts remained dominated by Roman Catholic denominations. As a modern nation-state, the country was first unified in 1871, with the inception of the German Empire. After the proclamation of the Weimar Republic in 1918 the Third Reich followed in 1933. The period was marked by a dictatorship and the initiation of World War II. After 1945, Germany was divided by allied occupation, and evolved into two states, East Germany and West Germany. In 1990 Germany was reunified. West Germany was a founding member of the European Community in 1957, which became the EU in 1993. It is part of the Schengen Area and since 1999 a member the eurozone.[7][8][9]