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
84%
4%
7%
3%
420
flagSpain
84%
3%
7%
3%
92
flagthe United States
83%
7%
2%
4%
350
flagCanada
83%
3%
3%
6%
31
flagSwitzerland
82%
0%
0%
17%
23
flagUnknown
82%
0%
4%
13%
23
flagRussia
81%
4%
3%
8%
83
flagAustria
80%
12%
3%
3%
55
flagRepublic of Ireland
80%
4%
4%
4%
21
flagAustralia
79%
8%
5%
5%
34
flagPoland
78%
4%
10%
5%
7703
flagUkraine
78%
3%
10%
7%
57
flagGreece
78%
3%
18%
0%
33
flagGermany
77%
5%
10%
5%
246
flagthe United Kingdom
72%
5%
8%
11%
159
flagBrazil
68%
13%
6%
8%
60
flagIndia
68%
18%
6%
6%
48
flagthe Netherlands
66%
8%
18%
4%
50
flagMexico
60%
8%
15%
6%
45