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
87%
5%
2%
5%
40
flagRussia
84%
3%
3%
6%
33
flagCanada
84%
0%
7%
0%
13
flagthe United States
83%
7%
1%
4%
258
flagGreece
83%
5%
11%
0%
18
flagUnknown
82%
0%
4%
13%
23
flagSwitzerland
81%
0%
0%
18%
11
flagPoland
77%
4%
11%
5%
6183
flagUkraine
77%
6%
9%
6%
31
flagGermany
70%
9%
13%
5%
75
flagIndia
70%
23%
3%
3%
30
flagAzerbaijan
70%
10%
20%
0%
10
flagthe United Kingdom
66%
7%
11%
11%
109
flagAustralia
66%
13%
13%
6%
15