The Mississippi River borders Illinois on the west.
Illinois borders the Mississippi River to the west.
The Mississippi River.
The major river that borders this area on the west is the Mississippi River.
Illinois borders Indiana to the west.
The Ohio river valley begins in the northern borders of West Virginia and Kentucky; and the southern borders of Ohio, Indiana and Illinois. The Ohio river empties into the Mississippi river near Cairo Illinois.
Ohio River
The Ohio River forms the borders of West Virginia, Ohio, Kentucky, Indiana, and Illinois. The border terminates at the confluence with the Mississippi and the border with Pennsylvania.
Pennsylvania, West Virginia, Ohio, Kentucky, Indian, Illinois
Missouri is bordered by Illinois across the Mississippi River to the east; Arkansas to the south; and and Kansas to the west.
On the west, Illinois is bordered by Iowa and Missouri.
The Ohio River