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
Hamburg is made up of seven boroughs (German: "Bezirke") and subdivided into 104 quarters (German: "Stadtteile"). There are 181 localities (German: "Ortsteile"). The urban organization is regulated by the Constitution of Hamburg and several laws. Most of the quarters were former independent cities, towns or villages annexed into Hamburg proper. The last large annexation was done through the Greater Hamburg Act of 1937, when the cities Altona, Harburg and Wandsbek were merged into the state of Hamburg. The "Act of the Constitution and Administration of Hanseatic city of Hamburg" established Hamburg as a state and a municipality. Some of the boroughs