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
General German Workers' Association establishment of the German Empire. Its members were known colloquially throughout Germany as Lassalleans. The ADAV was founded in Leipzig by Ferdinand Lassalle and twelve delegates from some of the most important cities in Germany, namely Barmen, Dresden, Düsseldorf, Elberfeld, Frankfurt am Main, Hamburg, Harburg, Cologne, Leipzig, Mainz and Solingen. The ADAV sought to advance the interests of the working class and to work for the establishment of socialism by the use of electoral politics. Lassalle acted as president from 23 May 1863 until his death in a duel on 31 August 1864. The unofficial organ of the ADAV was