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With a total area of over 800,000 km², the Danube River Basin covers 10% of Continental Europe. While the main river flows through ten countries, the full basin including its tributaries covers nine more. It is a unique artery through the heart of Europe, connecting East to West, and Black Forest to Black Sea.

The Danube River Basin is Europe's second largest river basin, with a total area of 801,463 km². It is the world's most international river basin, flowing through the territory of 19 countries. The ecosystems of the Danube River Basin are highly valuable in environmental, economic, historical and social terms, but they are subject to increasing pressure and serious threats of pollution from agriculture, industry and cities.