
Austria is a small central European state with a mountainous landscape. The two main features of the Austrian terrain are the Danube and the Alps. The Danube is the largest river in Austria and the second-longest river in Europe. It rises in Germany and flows through Ukraine, Moldova, Bulgaria, Serbia, Romania, Croatia, Slovakia, Hungary, and Austria before flowing into the Black Sea. Nearly all of Austria is drained by the Danube, which also provides over 65.7% of the country's national electricity.
| Characteristics | Values |
|---|---|
| Name | Danube (Donau) |
| Length | 2,850 km (1,770 mi) |
| Countries Flows Through | Germany, Austria, Slovakia, Hungary, Croatia, Serbia, Romania, Bulgaria, Moldova, Ukraine |
| Drainage Basin | 817,000 km2 (315,000 sq mi) |
| Cities | Vienna, Bratislava, Budapest, Belgrade |
| River Basin in Austria | 96% of the country's territory |
| River Basin Population | 7.7 million people |
| Gradient in Austria | 0.4 ‰ |
| Average Height Above Sea Level | 115.75 m |
| Deepest Point | 1.8 m |
| Salt Concentration | 2,000mg/l |
| River Flows Into | Black Sea |
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What You'll Learn

The Danube is the biggest river in Austria
The Danube is a significant geographical feature in Austria, and its basin covers approximately 10% of the country's total area. The river is an essential source of irrigation for agriculture, with over 40% of Austria's Danube Basin used for farming. Additionally, the river provides flat lands that are vital for human settlements and infrastructure in a country dominated by the Alps. The Austrian section of the Danube has a steep gradient of approximately 0.4‰, which is much steeper than in Lower Bavaria.
The Danube also serves as a major international commercial waterway and is an important source of hydroelectric power for Austria. The river is navigable by ocean ships from the Black Sea to Romania, and smaller vessels can travel even further upstream. The Danube has historically been significant, dating back to the Roman Empire, and it remains a vital economic and cultural force in Austria today.
The river is also a popular tourist destination, with the Donau-Auen National Park in Vienna offering a protected area for its diverse ecosystem. The park covers 9,300 hectares and showcases the characteristics of a large Alpine stream. The Danube is also a source of drinking water for nearly 100% of Austria's domestic supply.
The International Commission for the Protection of the Danube River (ICPDR) was established in 1998 to oversee the entire Danube river basin, including its tributaries and groundwater resources. The commission aims to promote sustainable and equitable water management and includes Austria and 13 other member states.
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The Rhine forms part of Austria's boundary with Switzerland
Austria is a small central European state with a mountainous landscape. The country is home to a network of rivers, the largest of which is the Danube. The second-longest river in Europe, the Danube flows through ten countries, including Austria, and empties into the Black Sea.
The Rhine is another important river in Europe. It is one of the longest rivers in Central and Western Europe and forms part of the border between several countries, including Austria and Switzerland. The Rhine rises in Graubünden in Switzerland and flows through the Rhineland and Holland before emptying into the North Sea. The river has been an important navigable route for centuries, facilitating trade and the movement of goods.
Austria's rivers are a significant economic, geographical, and cultural force. They provide water for irrigation and produce over 65.7% of the country's national electricity through hydropower. The Austrian section of the Danube, in particular, is utilised for hydroelectric power generation, navigation, and drinking water supply.
The Rhine and Danube rivers also contribute to Austria's diverse ecosystems. The Danube basin, for example, covers mountainous terrain, hilly regions, and low-lying plains, supporting a wide range of habitats, plants, and animals. The Donau-Auen National Park, located along the Danube, is an ecologically intact area that showcases the characteristics of a large Alpine stream.
In addition to their ecological and economic significance, Austria's rivers, including the Rhine and Danube, have shaped the country's history and culture. The Danube, for instance, was once a frontier of the Roman Empire, while the Rhine formed part of the northern inland frontier of the Roman Empire.
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The Drava is the third-longest river in Austria
The Drava is a significant component of the Danube River system, which drains over 96% of Austria's territory. The Danube itself is the second-longest river in Europe, flowing through ten countries and serving as a border between several of them. It rises in the Black Forest of Germany and empties into the Black Sea.
The Danube is a major geographical, economic, and cultural force in Austria, providing flat lands essential for agriculture, settlements, and infrastructure in a country dominated by the Alps. The Austrian section of the Danube is characterised by a steep gradient, which, together with development in valley floor areas, has made flooding a persistent issue.
The Drava is also an important source of hydropower, with twelve hydroelectric dams planned for the Austrian section of the Danube to stabilise its flow and generate energy. The Danube is further utilised for navigation, serving as a major international commercial waterway.
Austria's rivers are heavily utilised for agriculture, industry, and energy production, and the country has a long history of dealing with floods and landslides due to the impact of human activities on river systems and the challenging geographical conditions.
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The River Inn flows through Germany, Austria and Switzerland
The Danube is the largest river in Austria, with 96% of the country draining into it. It is also the second-longest river in Europe, stretching 1,770 miles.
The River Inn, however, flows through Germany, Austria, and Switzerland. It is the fourth-largest river in Germany and the second-largest river in Austria. The Inn rises in Lake Lughino in Switzerland and flows northeast across western Austria and southern Germany. The river is 510km (317 miles) long, according to one source, and 518km (322 miles) long, according to another. In Austria, the river first enters the narrow Oberinntal (upper Inn Valley), lying above Zirl, and then the Unterinntal (lower Inn Valley), which includes Innsbruck. The river then runs along the Bavarian border, passing through picturesque towns such as Rosenheim and Wasserburg am Inn. In Bavaria, the Inn is joined by its two main tributaries, the Salzach and Alz rivers. From here to the Danube, the Inn forms the border between Germany (Bavaria) and Austria (Upper Austria). The Inn finally enters the Danube in Passau, Germany, where the Danube, Inn, and Ilz rivers converge. The Inn is considered a tributary of the Danube, which has a greater length and drains a larger surface area. The Inn is the only river originating in Switzerland that ends in the Black Sea, via the Danube.
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The Danube is the second-longest river in Europe
The Danube is a large and historically important river, once forming a frontier of the Roman Empire. In the 21st century, it connects and links the countries of the Balkan Peninsula to each other and the rest of Europe. The river has played a vital role in the settlement and political evolution of central and southeastern Europe. Its banks, lined with castles and fortresses, formed the boundary between great empires, and its waters served as a vital commercial highway between nations.
The river is known as the most biodiverse region in Europe, home to 5,000 species of animals, birds, and plants. The Danube river basin includes a variety of natural conditions that affect the origins and regimes of its watercourses. These conditions favour the formation of a branching, dense, deep-water river network that includes some 300 tributaries, more than 30 of which are navigable. The river basin expands unevenly along its length, covering about 18,000 square miles (47,000 square kilometres) at the Inn confluence, 81,000 square miles (210,000 square kilometres) after joining with the Drava, and 228,000 square miles (590,000 square kilometres) below the confluences of its most affluent tributaries, the Sava and the Tisza.
The Danube is the largest river in Austria and has the most extensive drainage basin. It flows within Austria for 350 kilometres, or about one-eighth of its entire course. Within Austria, it is still considered a mountain or Alpine river, above the lower cyprind zone, as it drops rapidly for about 145 metres towards the Hungarian plain. The Austrian section of the Danube is an important energy resource, with twelve hydroelectric dams with locks and plants planned for development.
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Frequently asked questions
The Danube is the biggest river in Austria. It is also the second-longest river in Europe, after the Volga in Russia.
The Danube flows through Germany, Ukraine, Moldova, Bulgaria, Serbia, Romania, Slovakia, Hungary, and Croatia.
The River Inn is the second-biggest river in Austria. It flows through Germany, Austria, and Switzerland.

























