Berlin is the capital and largest city of Germany by both area and population. Its 3,723,914 (2018) inhabitants make it the second most populous city proper of the European Union after London. The city is one of Germany’s 16 federal states. It is surrounded by the state of Brandenburg, and contiguous with its capital, Potsdam.
Berlin straddles the banks of the River Spree, which flows into the River Havel (a tributary of the River Elbe) in the western borough of Spandau. Among the city’s main topographical features are the many lakes in the western and southeastern boroughs formed by the Spree, Havel, and Dahme rivers (the largest of which is Lake Müggelsee). Due to its location in the European Plain, Berlin is influenced by a temperate seasonal climate. About one-third of the city’s area is composed of forests, parks, gardens, rivers, canals and lakes. The city lies in the Central German dialect area, the Berlin dialect being a variant of the Lusatian-New Marchian dialects.
Berlin is a world city of culture, politics, media and science. Its economy is based on high-tech firms and the service sector, encompassing a diverse range of creative industries, research facilities, media corporations and convention venues.
Source: en.wikipedia.org