Berlin (/bərˈlɪn/; German pronunciation: [bɛɐ̯ˈliːn] is the capital city of Germany and one of the 16 states of Germany. It is the second most populous city proper and the seventh most populous urban area in the European Union. Located in northeastern Germany on the River Spree, it is the center of the Berlin-Brandenburg Metropolitan Region. Due to its location in the European Plain, Berlin is influenced by a temperate seasonal climate. Around one third of the city's area is composed of forests, parks, gardens, rivers and lakes.