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
History of Hamburg to the central government. The German constituent states were replaced in 1935 by regional districts (German: "Gau") led by Nazi Party officials who obeyed the central government's orders. On 16 May 1933 Karl Kaufmann (1900–1969) was appointed as "Reichsstatthalter" (imperial governor or imperial lieutenant) in Hamburg. The Hamburg Senate had resigned in March 1933 and the Hamburg Parliament elected Carl Vincent Krogmann (NSDAP) as mayor. In 1938 the city boundaries were extended with the Greater Hamburg Act to incorporate Wandsbek, Harburg, Wilhelmsburg and Altona. On 1 April 1938 Constitution of Hamburg was suppressed through an Imperial Law (German: "Reichsgesetz"), the