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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.

Many people consider droughts to be rare, but in fact they are a normal and recurrent feature of the climate. Drought events are regional phenomena, affecting transnational water management. Unfortunately, droughts have a high damage potential: economic losses, ecological damages, and implications on human health.

The territory of Bulgaria is 110,912 km². The country is characterized by a rich diversity in morphological, geological, geomorphological, hydro-climatic and soil-biogenic aspects.

Historically, the Danube and some of its tributaries have formed important trade routes across Europe. The harnessing of these rivers to facilitate navigation has radically changed their physical and ecological characteristics, while pollution from ships and boats is also a significant problem. In order to address this problem, the ICPDR is undertaking various activities.

The Black Sea Commission is an intergovernmental organisation responsible for the implementation of the Convention on the Protection of the Black Sea against Pollution, and sets the legal framework required for regional cooperation and the activities necessary to reduce pollution and enhance the protection of the marine environment.

The Danube River Basin is Europe's second largest river basin, with a total area of 801,463 km². It is the world's most international river basin, flowing through the territory of 19 countries. The ecosystems of the Danube River Basin are highly valuable in environmental, economic, historical and social terms, but they are subject to increasing pressure and serious threats of pollution from agriculture, industry and cities.

Since the 16th century, people have been changing the natural course of the rivers in the Danube River Basin, mainly for flood defence, hydropower generation and navigation. All these changes affect the ecological quality of the rivers. Changes in the depth or width of a river typically reduce flow rates, interrupting natural sediment transportation as well as the migration routes of animals.

A river does not end at its bank. The Danube and its tributaries form many diverse riverine habitats, including intricate networks of water bodies, creeks and channels, floodplain forests, water meadows, lakes, gravel islands, sandy banks and the unique delta habitats by the shores of the Black Sea.

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.