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.
Three countries through which the equator passes along the Amazon River are Colombia, Brazil, and Ecuador.
France, Belgium, Netherlands
The Seine river runs only in France. See link for map.
You need to cross the River Styx (pronounced 'sticks')
Numerous countries, such as Egypt and Sudan. The Tropic of Cancer. The Sahara Desert.
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.