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The Sava is the Danube's largest tributary of the Danube in terms of discharge and the second largest in terms of catchment area. The Sava is shared by Slovenia, Croatia, Bosnia and Herzegovina, Serbia and Montenegro. The joint management arrangements acted as a pilot for the implementation of the European Union's Water Framework Directive for the Danube and Europe.

Covering an area of 157,186 km², the Tisza River Basin is the largest sub-basin of the Danube River Basin. The Tisza River is the longest tributary of the Danube (966 km), and second largest in terms of flow after the Sava. The countries of the Tisza Basin (Ukraine, Romania, Hungary, Slovakia, Serbia) agreed to close transboundary co-operation, aiming to achieve integrated water resources management of the Basin.

Floods are natural phenomena. They can, however, turn into disasters causing widespread damage, health problems and even deaths. This is especially the case where rivers have been cut off from their natural floodplains, are confined to man-made channels, and where houses and industrial sites have been constructed in areas that are naturally liable to flooding.