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
flagItaly
88%
4%
3%
3%
62
flagCanada
88%
0%
5%
0%
18
flagAustria
86%
6%
6%
0%
15
flagthe United States
84%
6%
2%
4%
277
flagRussia
84%
4%
2%
6%
45
flagthe Netherlands
83%
0%
16%
0%
12
flagUnknown
82%
0%
4%
13%
23
flagArmenia
81%
0%
9%
9%
11
flagBelarus
80%
10%
0%
10%
10
flagPoland
78%
4%
11%
5%
6559
flagSwitzerland
78%
0%
0%
21%
14
flagUkraine
76%
5%
10%
7%
39
flagGreece
75%
3%
21%
0%
28
flagIndia
74%
20%
2%
2%
35
flagGermany
72%
8%
12%
4%
101
flagAustralia
72%
12%
8%
8%
25
flagAzerbaijan
70%
10%
20%
0%
10
flagthe United Kingdom
66%
7%
11%
12%
114