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.
2003 European heat wave
In Germany, shipping could not navigate the Elbe or Danube, as a result of low water levels. Around 300 people—mostly elderly—died during the 2003 heatwave in Germany.