
The Danube River is the second-longest river in Europe, flowing for 1,770 miles (2,850 km) from its source in the Black Forest Mountains of Germany to its mouth on the Black Sea. Along its course, it passes through or borders ten countries: Germany, Austria, Slovakia, Hungary, Croatia, Serbia, Bulgaria, Romania, Moldova, and Ukraine. The river has played a significant role in trade, transportation, and the economic growth of the cities along its banks, including the national capitals of Vienna (Austria), Bratislava (Slovakia), Budapest (Hungary), and Belgrade (Serbia).
| Characteristics | Values |
|---|---|
| Name | Danube River |
| Length | 1,770 miles (2,850 km) or 1,785 miles (2,872 km) |
| Origin | Black Forest Mountains, Germany |
| Mouth | Black Sea |
| Countries | Germany, Austria, Slovakia, Hungary, Croatia, Serbia, Bulgaria, Romania, Moldova, Ukraine |
| Capitals | Vienna, Bratislava, Budapest, Belgrade |
| Tributaries | Sava, Tisza, Breg, Brigach |
| Fish Species | Sturgeons, Salmon |
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What You'll Learn

The Danube River is the second-longest in Europe
The Danube River is the second-longest river in Europe, after the Volga in Russia. Originating in Germany's Black Forest mountains, the river flows for approximately 1,770 miles (2,850 kilometres) to its mouth on the Black Sea. The Danube is a large and historically important river, once forming the frontier of the Roman Empire. It is also a major waterway for trade and transportation in Central and Eastern Europe.
The river connects ten European countries, flowing through or marking the border of Germany, Austria, Slovakia, Hungary, Croatia, Serbia, Romania, Bulgaria, Moldova, and Ukraine. The Danube's drainage basin covers 315,000 square miles (817,000 square kilometres) and extends into nine additional countries. The river is home to a diverse array of fish species, including pike, zander, carp, sturgeon, salmon, and trout.
The Danube has played a significant role in the cultural and economic exchange of the region. Notable cities along its banks include Vienna, Budapest, and Belgrade, with four national capitals located on the river: Vienna, Bratislava, Budapest, and Belgrade. The river's majesty has been celebrated in music and literature, such as Johann Strauss the Younger's waltz "An der schönen, blauen Donau" and Jules Verne's "The Danube Pilot."
The Danube River Basin is an important ecological region, known as the most biodiverse in Europe. It is home to approximately 5,000 species of animals, birds, and plants. The International Commission for the Protection of the Danube River (ICPDR) was established in 1998 to ensure the conservation and maintenance of the river's natural heritage. The ICPDR consists of 14 member states and works to promote sustainable water management and the implementation of relevant directives.
The river has also been an important trade artery, harnessed for hydroelectric power, and its waters have served as a vital commercial highway. The cities along its banks have depended on the Danube for their economic growth. The Danube's upper courses, in particular, have been crucial for hydroelectric power generation.
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It rises in the Black Forest mountains of Germany
The Danube River, the second-longest river in Europe, rises in the Black Forest mountains of western Germany. The river begins as two small streams, the Breg and Brigach, which join at Donaueschingen, where the river gets its name. From there, the Danube flows for some 1,770 miles (2,850 km) through Central and Southeastern Europe, passing through or bordering nine other countries: Austria, Slovakia, Hungary, Croatia, Serbia, Bulgaria, Romania, Moldova, and Ukraine. The river has been an important trade route since ancient times, and its banks are lined with castles and fortresses, testifying to its role in the political evolution of central and southeastern Europe.
The Black Forest is a mountainous region in Germany's southwestern state of Baden-Württemberg, bordering France and Switzerland. The forest's name, Schwarzwald in German, comes from its dense coniferous tree cover, which casts a dark shadow over the landscape. The region is known for its picturesque villages, spa towns, and outdoor activities such as hiking and skiing.
The upper course of the Danube stretches from its source to the Hungarian Gates gorge in the Austrian Alps and the Western Carpathian Mountains. This section of the river is known for its scenic beauty, including the Wachau Valley and the Nationalpark Donau-Auen in Austria. The middle course of the river runs from the Hungarian Gates to the Iron Gate in the Southern Romanian Carpathians. The lower course flows from the Iron Gate to its mouth at the Black Sea, forming a deltalike estuary.
The Danube's vast drainage basin covers some 315,000 square miles (817,000 square kilometers) and includes parts of nine additional countries: Poland, Switzerland, Italy, Czech Republic, Slovenia, Bosnia and Herzegovina, Montenegro, North Macedonia, and Albania. The river is an important source of hydroelectric power, particularly along its upper courses, and cities along its banks, including Vienna, Budapest, and Belgrade, have depended on it for their economic growth.
The Danube River is also known for its cultural significance, celebrated in music such as the waltz "An der schönen, blauen Donau" (The Blue Danube) by Johann Strauss the Younger. The river's banks offer a wealth of tourist attractions, including hiking and biking trails that showcase the natural beauty and historical landmarks along the Danube.
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The river passes through 10 countries
The Danube River, the second-longest river in Europe, passes through ten countries. Originating in Germany's Black Forest mountains, the river flows for some 1,770 miles (2,850 km) before reaching the Black Sea. The Danube is a major waterway for trade and transportation in central and eastern Europe, and its banks are lined with castles and fortresses.
The river passes through Germany, Austria, Slovakia, Hungary, Croatia, Serbia, Bulgaria, Romania, Moldova, and Ukraine. It irrigates four capital cities: Vienna, Bratislava, Budapest, and Belgrade. The Danube also flows through several other notable cities, including Passau, Grein, and Regensburg in Germany, and Salzburg and Vienna in Austria.
The Danube has played a vital role in the settlement and political evolution of central and southeastern Europe. Its waters have served as a commercial highway between nations, and its banks were once a frontier of the Roman Empire. The river also has cultural significance, with the waltz "An der schönen, blauen Donau" ("The Blue Danube") by Johann Strauss the Younger becoming a symbol of imperial Vienna.
The Danube is an important trade artery and has been harnessed for hydroelectric power, particularly along its upper courses. The cities along its banks have depended on the river for their economic growth. The river's drainage basin amounts to 817,000 km2 (315,000 sq mi) and extends into nine more countries: Poland, Switzerland, Italy, the Czech Republic, Slovenia, Bosnia and Herzegovina, Montenegro, North Macedonia, and Albania.
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It has been an important trade route for centuries
The Danube River, the second-longest river in Europe, has been an important trade route for centuries. Originating in Germany's Black Forest mountains, the river flows through or borders nine other countries: Austria, Slovakia, Hungary, Croatia, Serbia, Romania, Bulgaria, Moldova, and Ukraine. With a length of 2,850 kilometres (1,770 miles), the Danube has served as a vital commercial highway and transportation route for central and eastern Europe.
Since ancient Roman times, the Danube has been a significant trade route, connecting the Balkan region to the rest of Europe. The river's middle course, particularly the stretch known as the "Hungarian Gates" in the Austrian Alps and Western Carpathian Mountains, is marked by low banks and a wide riverbed, making it ideal for navigation. This section of the river played a crucial role in trade and transportation during the medieval period, as evident in the well-maintained old town, stone bridge, and cathedral in Regensburg, Germany.
The Danube's upper course, which includes the Wachau Valley and the Nationalpark Donau-Auen in Austria, has been a popular tourist destination. Leisure and travel cruises operate along this section of the river, contributing to the regional tourism industry. The river's lower course, flowing from the Iron Gate gorge to the Black Sea, is equally significant. This section of the river connects the Port of Rotterdam and the industrial centres of Western Europe to the Black Sea through the Rhine-Main-Danube Canal.
The Danube has also played a vital role in the settlement and political evolution of central and southeastern Europe. The river's banks were once the boundary between great empires, and its waters continue to be an important transport route within the European Union, known as "Corridor VII". The river's significance as a trade route has led to the development of major cities along its course, including four national capitals: Vienna, Bratislava, Budapest, and Belgrade. These cities have flourished economically due to their reliance on the Danube for trade and transportation.
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The Danube is a source of hydroelectric power
The Danube River, the second-longest river in Europe, is a vital source of hydroelectric power. It rises in the Black Forest Mountains of western Germany and flows for some 1,770 miles (2,850 km) to its mouth on the Black Sea. Along its course, it passes through or borders ten countries: Germany, Austria, Slovakia, Hungary, Croatia, Serbia, Bulgaria, Romania, Moldova, and Ukraine.
The Danube is an important source of renewable and environmentally friendly energy for the countries through which it flows. The river's upper courses, in particular, are ideal for generating hydropower due to the natural gradient of the riverbed. The Danube is harnessed for hydroelectric power through the construction of dams and power plants. There are a total of 59 dams along the first 1,000 kilometers of the Danube, with the largest hydropower dam and reservoir system located at the 117-km-long Djerdap Gorge (Iron Gate Dam I and II), jointly operated by Serbia and Romania.
Austria, for example, relies heavily on hydropower from the Danube, with about 60% of the country's yearly electricity production originating from hydropower, 20% of which is produced directly from the Danube. The river is Austria's most important energy supplier, and the country has several power plants along the Danube, including VERBUND's power plants in Upper Austria, Lower Austria, and Vienna, which are among the biggest in Central Europe.
The Danube is also an important source of hydropower for other countries along its course. In Slovakia, hydropower accounts for about 16% of the country's energy mix, with 11% coming from the Gabcikovo hydropower plant. Serbia and Romania also benefit from the Iron Gate Dam, which produces about 37% of Serbia's total energy and 27% of Romania's. Additionally, the German Free State of Bavaria, which covers more than half of the Upper Danube basin, generates about 18% of its hydroelectric power from the river.
However, the construction and operation of hydropower plants along the Danube have faced challenges and concerns. Existing and planned constructions can cause hydromorphological alterations, leading to negative impacts such as river and habitat interruptions, disconnection of wetlands and floodplains, and changes in the natural structure of rivers. There is a need to balance the increasing demand for hydropower with the potential ecological consequences, ensuring that interventions in the Danube are minimized to preserve species diversity for future generations.
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Frequently asked questions
The Danube River, the second-longest river in Europe, runs through Germany, Austria, and Hungary, as well as Slovakia, Croatia, Serbia, Bulgaria, Romania, Moldova, and Ukraine.
The Danube River flows for approximately 1,770 miles (2,850 kilometres) from its source in the Black Forest Mountains of Germany to its mouth on the Black Sea.
The Danube flows through the German city of Regensburg, the Austrian capital of Vienna, and the Hungarian capital of Budapest.

































