Which river is a tributary of the Mississippi?

Missouri River
Columbia River
Rio Grande
Potomac River
Missouri is the longest tributary of the Mississippi River, it constitutes to 40% of its watershed. However, it is not the largest tributary by volume - more water is brought by the Ohio River.
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Missouri River
Columbia River
Rio Grande
Potomac River
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4%
2%
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3%
7%
3%
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84%
3%
7%
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84%
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6%
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4%
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17%
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4%
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80%
5%
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85
flagRepublic of Ireland
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79%
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6%
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79%
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34
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78%
4%
10%
5%
7728
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78%
5%
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259
flagAustria
78%
12%
3%
5%
56
flagGreece
78%
3%
18%
0%
33
flagthe United Kingdom
73%
5%
7%
10%
164
flagIndia
69%
18%
6%
6%
49
flagBrazil
68%
13%
6%
8%
60
flagthe Netherlands
66%
8%
18%
4%
50
flagMexico
58%
8%
17%
6%
46