Berlin is the capital city of Germany and one of the 16 states of Germany. With a population of 3.3 million people,
Berlin is Germany's largest city and 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, which has about 4½ million residents from over 180 nations. 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.
First documented in the 13th century, Berlin was the capital of the Kingdom of Prussia (1701–1918), the German Empire (1871–1918), the Weimar Republic (1919–33) and the Third Reich (1933–45). Berlin in the 1920s was the third largest municipality in the world. After World War II, the city, along with the German state, was divided - into East Berlin — capital of the German Democratic Republic, colloquially identified in English as East Germany — and West Berlin, a political exclave (surrounded by the Berlin Wall from 1961 to 1989) and a de facto (although not de jure) state of the Federal Republic of Germany, known colloquially in English as West Germany from 1949 to 1990. Following German reunification in 1990, the city was once more designated as the capital of all Germany.