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The floodplains and wetlands of the Danube basin are uniquely valuable ecosystems in global terms, although few areas are still in their natural or near-natural state.

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.

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.