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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.

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.

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.

The International Commission for the Protection of the Danube River (ICPDR) works to ensure the sustainable and equitable use of waters in the Danube River Basin. The work of the ICPDR is based on the Danube River Protection Convention (DRPC), the major legal instrument for cooperation and transboundary water management in the Danube River Basin.

The Danube and its tributaries host a variety of fascinating and diverse ecological territories with many unique plants and animals. The rich and unique biodiversity and riverine habitats have been under severe pressure due to human activities for centuries. However, today the protection of environment and biodiversity is on the political agenda of the different Danubian States.

The best way to protect and manage water is by close international co-operation between all the countries within the river basin – bringing together all interests upstream and downstream. All countries of the European Union are using a river basin approach for water management since the adoption of the EU Water Framework Directive.