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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 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.