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“29 June” is the international Danube Day. It was first celebrated by the ICPDR in 2004 to highlight the 10th anniversary of the signing of the Danube River Protection Convention. Through the joint effort of different organizations, the celebration of Danube Day throughout the Danube River Basin became an annual event, paying tribute to the Danube and the rivers that flow into it.

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.