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The Helena River and Canning River
The two largest tributaries are the Missouri River (west) and the Ohio River (east).(see related question)
tributaries of amazon river is tapajos river and madeira river
The major rivers are the the Missouri, Ohio, and the Arkansas River. Other tributaries are the Minnesota River (Minnesota), Illinois River (Illinois), White River (Arkansas), Yazoo River (Mississippi), and part of the Red River (Louisiana).
The Missouri and the Ohio rivers are the two major rivers that merge into the Mississippi.
There are two Eel Rivers in Indiana and both are tributaries of the Wabash River.
Two two largest Tributaries of the Mississippi River are the Missouri River and the Ohio River. The Missouri River intersection is just below St. Louis and essentially doubles the size of the River. The Ohio River (which is joined by both the Cumberland River at Smithland Ky. and the Tennessee River at Paducah Kentucky) joins the Mississippi River at Cairo, Illinois about 950 Miles above the Head of the Passes. The Ohio River combined with the Mississippi forms what is referred to as the lower Mississippi River and again it doubles in size. There are no locks and dams on the lower Mississippi River. The Ohio River is actually as wide if not wider than the Mississippi River at their junction. A large part of that is due to the Cumberland and Tennessee Rivers both very large Rivers in themselves joining the Ohio. The Cumberland joins about 62 miles above the mouth of the Ohio and the Tennessee joins the Ohio River only about 50 miles above the junction with the Mississippi River. Two more good size rivers the Illinois River joins the Upper Mississippi and the Arkansas River joins the lower. There are many more smaller rivers which join. I answered this in a question naming all the Tributaries of the Mississippi River. Captain Jim Turner
Two main ones - the Blue Nile and the White Nile.
The Missouri and the Ohio rivers are the two major rivers that merge into the Mississippi.
Black Volta and White Volta
Bhagirathi and Alaknanda are two most important tributaries of Ganga. Both tributaries meet at Devprayag to form Ganga.
Tributaries and distributaries. They're branches of a river.