The Dunaj, known as the Danube in English, is the second-longest river in Europe, flowing through ten countries. It originates in the Black Forest of Germany and travels approximately 2,860 kilometers before emptying into the Black Sea. The river is an important waterway for trade and transportation, connecting various European cities. The Dunaj passes through major cities such as Vienna, Budapest, and Belgrade, making it a vital cultural and economic resource. It is also famous for its scenic landscapes, historical significance, and diverse ecosystems, supporting various wildlife along its banks.