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
flagSpain
89%
4%
2%
4%
47
flagAustria
87%
8%
4%
0%
24
flagthe United States
84%
6%
2%
3%
306
flagItaly
82%
3%
8%
5%
158
flagUnknown
82%
0%
4%
13%
23
flagCanada
81%
0%
4%
9%
22
flagRussia
80%
6%
5%
6%
60
flagthe Netherlands
80%
0%
15%
3%
26
flagBelarus
80%
6%
6%
6%
15
flagPoland
78%
4%
10%
5%
7129
flagAustralia
78%
9%
6%
6%
32
flagGreece
77%
3%
19%
0%
31
flagUkraine
76%
3%
11%
7%
51
flagFrance
76%
14%
4%
4%
21
flagSwitzerland
76%
0%
0%
23%
17
flagIndia
75%
19%
2%
2%
36
flagGermany
74%
8%
10%
5%
154
flagRepublic of Ireland
73%
6%
6%
6%
15
flagthe United Kingdom
68%
6%
9%
13%
138
flagMexico
65%
3%
20%
6%
29