Danube
The Danube flows through many cities, including four national capitals (shown below in bold), more than any other river in the world. Ordered from the source to the mouth they are:
The Danube is navigable by ocean ships from the Black Sea to Brăila in Romania and by river ships to Kelheim, Bavaria, Germany; smaller craft can navigate further upstream to Ulm, Württemberg, Germany. About 60 of its tributaries are also navigable.
Dnieper
Almost of the river is navigational (to the city of Dorogobuzh). The Dnieper is important for the transport and economy of Ukraine: its reservoirs have large ship locks, allowing vessels of up to to access as far as the port of Kiev and thus create an important transport corridor. The river is used by passenger vessels as well. Inland cruises on the rivers Danube and Dnieper have been a growing market in recent decades.