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The Missouri River and its tributary, the Big Sioux, form the western border of Iowa.
Two rivers partially form Illinois State's Eastern boundary. The Wabash River is one river that forms Illinois' boundary. The Ohio River is the other river that forms the state's boundary.
It is the Danube River.
Mississippi
The Mississippi River forms the Western border of the States of Illinois, Tennessee, and Mississippi. The Mississippi River forms the Eastern border of the States of Iowa, Missouri, Arkansas, and Louisiana.
The Mississippi River forms the western border of Illinois.
Mississipi-Missouri
Missouri eventually enter the Mississippi river which then leads to the gulf of Mexico
Red River
The Minnesota River runs into the Mississippi. So do the Missouri, Illinois, and Ohio Rivers.
Mississippi
The Rio Grande River.