1. The Donau, or Danube, is Europe's second longest river, stretching over 2,850 kilometers (1,778 miles) in total and passing through 10 countries.
2. The Donau originates in Germany's Black Forest and drains into the Black Sea.
3. Along the way, it passes through such major cities as Vienna, Bratislava, Budapest, Belgrade, and Novi Sad.
4. It is Germany's longest river and serves as a vital source of transportation, irrigation, and irrigation for much of Europe.
5. In 1539, Hans Wurm was the first to navigate the entire river from Germany to the Black Sea.
6. In the Tudor period, German traders used the river for transporting wine, timber, wheat, and other goods to trading centers in Vienna, Budapest, and the Black Sea.
7. At the start of the Industrial Revolution, cargoes of coal, iron ore, and other resources were transported along the Donau.
8. Throughout its storied history, the Danube has seen several wars, including World War I and II.
9. The Donau has nearly 1,500 islands, and provides a diverse habitat for numerous species of native plants and animals.
10. Much of the river is protected by a series of parks and conservation areas.
11. Various types of recreational activities, such as swimming, rowing, and boat tours, have become popular on the Donau.
12. Along the Donau, many ports, bridges, and dams have been constructed to make navigation and access easier.
13. The Donau River has seen its share of pollution from industrial activities, but governments have responded by implementing legislation to protect the environment.
14. Most recently, the EU has launched its Blue Danube project, which aims to highlight the importance of water resources in Central and Eastern Europe.
15. The Donau remains an important symbol of international cooperation and development, connecting many different cultures along its banks.