The Mississippi river forms the boundary between Missouri and Illinois!
The Mississippi River forms the boundary between Illinois and Missorui
The Mississippi River forms the border between Missouri and Illinois.
Missouri River BasinThe Missouri River starts in Montana and flows through North and South Dakota, forms the boundary between Nebraska and Iowa and part of the boundary between Kansas and Missouri, and flows through Missouri to the Mississippi River.
The Mississippi River forms the western border of Illinois.
The Mississippi River spans the United States from Lake Itasca, Minnesota finally opening into the Gulf of Mexico. The nine pairs of American States for which the Mississippi forms the state boundary are Minnesota-Wisconsin, Iowa-Illinois, Missouri-Illinois,
the Big Sioux is used to define the boundary between South Dakota and Iowa.
The Mississippi River forms the western boundary of the State of Illinois.
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.
The Ohio River forms Ohio's southern border.
Lake Michigan
Mississippi river
Indiana and Illinois