Which geographic feature is indicated by #4?* Ohio River
Columbia River
Mississippi River
Missouri River

Correct answer is Missouri.

Explanation:

As I can see from the map Ohio is under number seven, Columbia is under number two, while Mississippi is under number 5, which leaves number 4 to Missouri.

The easiest way to conclude this is to see positions of Mississippi and Missouri as these two rivers are connected and are forming one of the largest water systems in the world.

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