Socialist Federal Republic of Yugoslavia
Regarding rivers, the Danube was navigable throughout its entire course in Yugoslavia, linking the ports of Belgrade, Novi Sad, and Vukovar with Central Europe and the Black sea. Long stretches of rivers Sava, Drava and Tisza were also navigable.
Elbe
The Elbe has been navigable by commercial vessels since 1842, and provides important trade links as far inland as Prague. The river is linked by canals (Elbe Lateral Canal, Elbe-Havel Canal, Mittellandkanal) to the industrial areas of Germany and to Berlin. The Elbe-Lübeck Canal links the Elbe to the Baltic Sea, as does the Kiel Canal, whose western entrance is near the mouth of the Elbe. The Elbe-Weser Shipping Channel connects the Elbe with the Weser.