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
German frigate Hamburg March and 3 June 2013 "Hamburg" deployed with the carrier combat group, and was tasked with co-ordinating all flight movements within a radius of 180 km, including all take-offs and landings on the carrier. "Hamburg" was the first German ship to fully integrate into an American Strike group, and it was the first time in the history of the US Navy that a German frigate was entrusted with the sole protection of an American aircraft carrier. On 11 February 2014 "Hamburg" deployed from Wilhelmshaven with the frigates "Mecklenburg-Vorpommern" and "Augsburg", the corvette "Oldenburg " and the storeship "Frankfurt am Main"