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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Answers by country

Missouri River
Columbia River
Rio Grande
Potomac River
answers
flagFrance
86%
6%
4%
2%
43
flagItaly
85%
3%
6%
3%
445
flagSpain
84%
3%
7%
3%
92
flagCanada
84%
3%
3%
6%
32
flagthe United States
83%
7%
2%
4%
355
flagUnknown
82%
0%
4%
13%
23
flagSwitzerland
82%
0%
0%
17%
23
flagRussia
80%
5%
4%
8%
85
flagGermany
79%
5%
10%
4%
265
flagUkraine
79%
3%
10%
6%
58
flagAustralia
79%
8%
5%
5%
34
flagPoland
78%
4%
10%
5%
7737
flagAustria
78%
12%
3%
5%
56
flagGreece
78%
3%
18%
0%
33
flagBelarus
75%
8%
12%
4%
24
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