Geography and urban development of Dresden past 60 years has made Dresden the fourth largest urban area in Germany after Berlin, Hamburg, and Cologne. The most important river in Dresden is the Elbe river, the only navigable body of water to flow through the city. There are also a number of tributaries such as the river Weißeritz. The nearest German cities are Chemnitz (80 km to the southwest), Leipzig (100 km to the northwest) and Berlin (200 km to the north). The Czech capital Prague is about 150 km to the south; the Polish city of Wrocław is about 200 km to the east. There are
Government of Hamburg the office of the protection of historical monuments, and the memorial site for the Neuengamme concentration camp. In 2005 its annual budget was €212.7 million. (German: "Arbeit, Soziales, Familie und Integration") (German: "Stadtentwicklung und Wohnen") Since law enforcement and police duties are partly in the responsibility of the German states, Hamburg has its own police force. This forces consists of the state police " Polizei Hamburg", the State Criminal Police Office (German: "Landeskriminalamt"), the Criminal Investigation Services ("Kriminalpolizei"), the Water Police ("Wasserschutzpolizei") controlling traffic in the port of Hamburg, the Stand-by Police ("Bereitschaftspolizei"), the Special Weapons and Tactics Unit ("Spezialeinsatzkommando")