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Top 10 longest rivers in the world

Can you name them all?
Last updated: February 02, 2015
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Length
River
4,180 mi.
Nile
3,912 mi.
Amazon
3,710 mi.
Mississippi-Missouri
3,602 mi.
Chang Jiang
3,459 mi.
Ob
Length
River
2,900 mi.
Huang Ho
2,800 mi.
Yenisei
2,795 mi.
Parana
2,758 mi.
Irtish
2,716 mi.
Zaire
+1
level 63
Oct 8, 2018
Given that the Irtysh is the principal tributary of the Ob (as the Missouri is of the Mississippi), is it right to consider it as a separate river? The Ob wouldn't be in 5th place without the Irtysh.