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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.

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.