The Wabash is the longest river in Indiana. It flows from Ohio across northern Indiana until it forms the border between Indiana and 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 Wabash River forms the southern portion of Indiana's western border. The northern portion of Indiana's western border is simply a straight line marked on the map. The southern border of Indiana is also a river - the Ohio.
The Colorado River
The Colorado River forms part of the southwest boundary of the United States.
Mississippi
The major bodies of water in Indiana include:Major Rivers - Ohio River, Wabash River, White River, Tippecanoe River.Major Lakes - Mississinewa Lake, Lake Michigan.
The Colorado river
The Rio Grande River
Ohio River
The Ohio River forms Ohio's southern border.
The Mississippi river forms the boundary between Missouri and Illinois!