Danube River

The Danube (In German: Donau, in Hungarian Duna, in Slovenian: Donava, in Croatian: Dunav, ancient Greek: Istros) is Europe's second longest river (after the Volga) and the longest river in the European Union with the total length of about 2,860 km. Danube originates in the Black Forest in Germany and flows through (or forms a part of a border of) Germany, Austria, Slovakia, Hungary, Croatia, Serbia, Bulgaria, Romania, Moldova, and Ukraine. Its drainage basin also includes parts of Italy, Poland, Switzerland, Czech Republic, Slovenia, Bosnia and Herzegovina, Montenegro, and Republic of Macedonia.

Danube's tributaries include, among the others, the following rivers:

• Inn
• Morava
• Drava
• Tisza
• Sava
• Great Morava
• Iskar
• Olt
• Osam
• Argeş
• Ialomiţa
• Siret
• Prut

The Danube flows through the following notable cities (ordered from source to mouth):

• Ulm (Baden-Württemberg, Germany)
• Regensburg (Bavaria, Germany
• Passau (Bavaria, Germany)
• Linz (Upper Austria)
• Vienna (capital of Austria)
• Bratislava (capital of Slovakia)
• Győr (Hungary)
• Budapest (capital of Hungary)
• Vukovar (Croatia)
• Apatin (Vojvodina, Serbia)
• Bačka Palanka (Vojvodina, Serbia)
• Novi Sad (capital of Vojvodina, Serbia)
• Belgrade (the capital of Serbia)
• Smederevo (Serbia)
• Moldova Nouă (Romania)
• Sulina (Romania)
• Vidin (Bulgaria)
• Silistra (Bulgaria)
• Izmail (Ukraine)