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.
The Ohio River forms the southern borders of Ohio and Indiana.
The Ohio River forms Ohio's southern border.
The Ohio river is located on the southern boundary of Indiana and Ohio. The Ohio River also borders northern Kentucky.
none of the rivers form the southern border of Indiana, but the Ohio river forms the southern border of Ohio.
Ohio River
The border is the Ohio River.
Unless, you live in the Midwestern United States you probably wouldn't know the Ohio River borders southeast Illinois, southern Indiana, and southern Ohio and runs all the way to Plattsburg, Pennslyvania.
Ohio
Ohio, Indiana & Illinois
ohio
Ohio River
Lake Erie forms the entire north border. The Ohio River forms the entire south border. There are no natural borders on the East or West borders of Ohio.