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.
Danube Banovina
The Danube Banovina or Danube Banate ( / Дунавска бановина), was a banovina of the Kingdom of Yugoslavia between 1929 and 1941. This province consisted of the geographical regions of Srem, Bačka, Banat, Baranja, Šumadija, and Braničevo. The capital city of the Danube Banovina was Novi Sad. The province was named after the Danube River.