The Danube River is the second-longest river in Europe, flowing for about 2,860 kilometers. It originates in the Black Forest of Germany and travels through ten countries, including Austria, Hungary, and Romania, before emptying into the Black Sea. The river is an important waterway for trade and transportation. The Danube is known for its scenic beauty, with picturesque landscapes and historic cities along its banks, such as Vienna and Budapest. It also supports diverse ecosystems and is home to various species of fish and birds, making it a vital natural resource for the region.