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.
Sava
The restricted draft and fairway is compounded with meandering of the river's course—limiting length of vessels—and low bridge clearance. Further problems are incurred through poor transport infrastructure along the route, including poor navigation markings, and presence of sunken vessels and unexploded munitions. Navigation along further of the river upstream to Rugvica near Zagreb is possible for vessels with tonnage below , and the section of the river belongs to the AGN's Category II. There are plans for restoration of the Category IV compliant waterway downstream of Sisak and betterment of navigation infrastructure between Sisak and Rugvica, as well as upgrading of the waterway between Brčko and Belgrade to Category Va, matching that of the Danube, with uninterrupted navigation through the year. The plan is planned to be supported by the European Union and , an agreement to implement the plan was signed by Bosnia-Herzegovina and Croatia, while Serbia is invited to join the project. The plan aims to increase safety and volume of river transport, which declined by about 70% since the breakup of Yugoslavia, largely because of poor maintenance of the route. The ISRBC is tasked with establishment of an international regime of navigation on the river since 2005.