The Mississippi River forms the western border of Illinois.
The Illinois River is entirely contained within the State of Illinois.
Mississippi.
The Ohio River
Illinois is bordered by the Mississippi River on the west.
Mississippi River
Mississippi river
The Mississippi River
Illinois is bordered by the Mississippi River on the west.
Illinois is bordered by the Mississippi River on the west
West Virginia, Ohio, Illinois, and Indiana form the northern border of Kentucky, along the Ohio River.
The Mississippi River