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The 1533 part of the Donau river is the largest source of drinking water in the Danube basin. It is the best-known section of the 2,860 km long river, the second longest in Europe after the Volga. The 1533 part of the river includes 7 countries : Germany, Austria, Slovakia, Hungary, Croatia, Serbia, and Romania. The river has been known for its uniqueness since ancient times. There are a variety of ecosystems along this part of the river that provide habitats for numerous species of fish, birds, and other wildlife. Furthermore, it is also a major trading hub and transportation route, as it connects several important cities across the region. Not only is it an important source of water and a vibrant ecosystem, but it is also full of cultural and historical significance.