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.
Sziget Festival
Being located on an island, some festival goers have tried to enter by swimming across the Danube or by paddling across in inflatable rafts. The organisers very much discourage these attempts as it is dangerous due to the tricky nature of the fast-flowing Danube river.