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
Accession of Hamburg to the German Customs Union (Zollverein) proposal on 14 June, which was carried by nine votes to six. The three Hanseatic cities, through their joint envoy Friedrich Krüger, voted against the Austrian proposal and made a declaration (formulated by Lübeck) that the events in Holstein did not justify Federal mobilisation, because the danger of immediate military collision had passed. Then on 16 June, Emil von Richthofen, the Prussian envoy to the Hanseatic states, presented to the Hamburg Senate and other German governments an "identical note" asking for an alliance on the basis of Prussia's reform proposal placed before the Diet and requesting that its troops be