ROBERT BROOK / SCIENCE PHOTO LIBRARY ROBERT BROOK / SCIENCE PHOTO LIBRARY
River ferry at the confluence of the River Sava and the River Danube, Belgrade, Serbia. The Sava flows from upper left, while the darker waters of the Danube flow from upper centre. The waters do not mix immediately, and a dividing line is seen across upper right. Parts of the historic city of Belgrade are seen in the distance at upper centre. The River Danube is a major European river, used to transport people and goods, flowing west-east from Germany to the Black Sea.
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