Berlin is the national capital of Germany and its largest city, with 3,416,255 inhabitants (as of December 2007).
On the day of German reunification, October 3, 1990 Berlin became an independent city-state like Hamburg and Bremen. Reunited Federal Germany consists of a total of 16 federal states, known as Länder. Berlin is subdivided into 12 administrative districts called Bezirke, which were amalgamated from the earlier 23 administrative units with effect from January 1, 2001.