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–Black Sea Canal
The construction plans for the canal took a different turn with the signing of the Treaty of Paris on March 30, 1856, ending the war. Russia ceded the Danube mouths to the Ottomans and southern Bessarabia (lately organised as the Cahul, Bolgrad and Ismail counties) to their vassal, Moldavia. The freedom of international navigation on the Danube was restored; passage taxes were canceled, police and quarantine rules were simplified; and the European Commission of the Danube was established, with representatives of 7 powers: Britain, France, Austria, Russia, the Ottoman Empire, the Kingdom of Prussia, and the Kingdom of Sardinia. The Commission was responsible for the clearing of the Danube mouths from deposits of the river, and when necessary with clearing natural barriers, with the goal of ensuring of good conditions for navigation. The effect was that Austria, Britain, and France changed their attitude to the project for a Danube-Black Sea canal. The newspaper "Zimbrul" announced on May 25, 1856 that the plan for building the canal was abandoned; instead a railroad line Cernavodă – Constanța was to be built. After two and a half years of construction, the latter was inaugurated on October 4, 1860. Following the building of a railway connection in 1860, goods were easily and inexpensively transported from Constanța by rail, so plans for a canal were again abandoned.