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The waters of Bosnia and Herzegovina are split between the Danube River Basin District and the Adriatic Sea Basin. Some 40.2% of the Sava river sub-basin, the second largest sub-basin of the Danube River Basin, lies in Bosnia and Herzegovina. The rest of the watershed is shared by Croatia, Serbia and Slovenia.

As both the largest remaining natural wetland and second largest river delta in Europe, the Danube Delta is one of the continent's most valuable habitats for wetland wildlife. Pollution and discharge manipulation from upstream has a huge effect on this area of high biodiversity, plus the delta continues to change ecologically itself – the Danube Delta spreads seaward at a rate of 10 to 25 metres every year.

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.

The Drava River is the fourth largest, as well as the fourth longest Danube tributary. It connects the Alps with the Danube and the Black Sea. The Drava has been considerably regulated with dams constructed to generate hydroelectricity and channels dredged to direct its flow. Nevertheless, natural habitats along the middle and lower reaches host unique varieties of flora and fauna, and several endemic species.

Water quality in the Danube has improved over the years, but there is still much work to be done to meet the region’s goals for water status. To improve the water quality, an ambitious programme of measures for the whole Danube River Basin District has been agreed under the EU WFD. To assess trends in water quality, the ICPDR oversees the TransNational Monitoring Network (TNMN). The network carefully monitors physical, chemical and biological conditions in the Danube and its tributaries, and provides in TNMN Yearbooks an annual overview of pollution levels as well as long term trends for water quality in the basin.

19 countries share the Danube River Basin, which makes it the world’s most international river basin. 79 million people of different cultures and languages call the Danube Basin their home. For centuries they have been interconnected through the widely ramified water system of the Danube. All countries sharing over 2,000 km² of the Danube River Basin, as well as the European Union, are contracting parties of the ICPDR.

The Danube is a major economic, geographical and cultural force in Austria. Draining over 96% of the country’s territory, the basin is home to 7.7 million people. In a country dominated by the Alps, the flat lands provided by the rivers are vital for the agricultural sector, human settlements and infrastructure. The Austrian territory accounts for 10% of the total area of the Danube 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.

The status of waters of the Danube River Basin is largely influenced by inputs of pollutants, particularly organic material, nutrients, hazardous substances and plastics. The ICPDR regularly updates specific emission inventories addressing both point source and diffuse emissions. The ICPDR also develops policy guidance documents providing recommendations for Danube countries on how to address pollution problems and the measures that need to be implemented in order to reduce emissions. In addition, the ICPDR supports capacity building activities on issues related to pollution control.