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
flagAustria
85%
7%
7%
0%
14
flagItaly
84%
6%
4%
4%
45
flagCanada
84%
0%
7%
0%
13
flagthe United States
83%
7%
2%
4%
265
flagRussia
83%
5%
2%
5%
36
flagUnknown
82%
0%
4%
13%
23
flagSwitzerland
81%
0%
0%
18%
11
flagthe Netherlands
80%
0%
20%
0%
10
flagPoland
78%
4%
11%
5%
6390
flagUkraine
76%
5%
11%
5%
34
flagAustralia
76%
9%
9%
4%
21
flagGermany
73%
8%
12%
4%
94
flagGreece
73%
4%
21%
0%
23
flagIndia
72%
21%
3%
3%
33
flagAzerbaijan
70%
10%
20%
0%
10
flagthe United Kingdom
66%
7%
11%
12%
112