It's in France
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The Mississippi River is entirely within the United States.
The river flows from southern Yukon Territory, Canada, through Alaska to the Bering Sea.
The equator passes through the countries of Ecuador, Brazil, and Colombia. The Amazon River also passes through these three countries.
France, Belgium, Netherlands
The Seine river runs only in France. See link for map.
Numerous countries, such as Egypt and Sudan. The Tropic of Cancer. The Sahara Desert.
You need to cross the River Styx (pronounced 'sticks')
Ocean, as it's the farthest distance of the three.
The Euphrates River is the longest river in Western Asia. The river has three riparian countries, Iraq, Syria and Turkey, and its basin is distributed among five countries with a total estimated population of 23 million.
The population of Cross River State is 1,865,604.