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Over-exploitation of water resources, water regime modifications, water contamination, and a growing number of flood events – negative effects of which are amplified by climate change – are all issues that require harmonised, integrated actions from management authorities in countries that share river basins.

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.