Köpenick is a historic town and locality (Ortsteil) in Berlin, situated at the confluence of the rivers Dahme and Spree in the south-east of the German capital. It was formerly known as Copanic and then Cöpenick, only officially adopting the current spelling in 1931. It is also known for the famous imposter Hauptmann von Köpenick.

Berlin is the capital and largest city of Germany, both by area and by population. Its more than 3.85 million inhabitants make it the European Union's most populous city, as measured by population within city limits. Simultaneously, the city is one of the states of Germany, and is the third smallest state in the country in terms of area. Berlin is surrounded by the state of Brandenburg, and Brandenburg's capital Potsdam is nearby. The urban area of Berlin has a population of over 4.5 million and is therefore the most populous urban area in Germany. The Berlin-Brandenburg capital region has around 6.2 million inhabitants and is Germany's second-largest metropolitan region after the Rhine-Ruhr region, and the fifth-biggest metropolitan region by GDP in the European Union.