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The Danube is the only of large European rivers that flows from west to east. Its source is still subject of scientific debate,
while its mouth widens year-in-year-out. Throughout its history, the river had a major role as a link and as a border, as the lifeblood of commerce...
![](https://i.ytimg.com/vi/eeyCq7sNOjQ/maxresdefault.jpg)