It has its origin Cottian Alps, Italy and mouth at the Adriatic Sea with basin countries of Italy and Switzerland.
The Seine River flows through France, though it may seem big enough to flow through many countries, it does only flow through the one and only France.
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The River Thames flows through 8 counties.
The Mackenzie River is one of the largest in all of Canada. It is long enough that it runs through at least 10 different towns throughout the Yukon.
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I find no mention of a river named Mediterranean River" anywhere on the Internet There are many rivers, running through many countries, around the Mediterranean Sea.
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The Nile is known to flow through 20 different country's.
It does not flow through Kenya.
The River Thames flows through 8 counties.
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Many rivers flow into the Danube River. One such river is the Morava River. It must be noted that the major river, Danube, empties into the Black Sea and before it reaches there, it passes through many nations and yes many rivers flow into it.