Ohio River
The Ohio River forms Ohio's southern border.
The Ohio River forms the southern borders of Ohio and Indiana.
The Ohio River is the southern boundary of Ohio and Indiana.
The Ohio River forms the southern boundaries of Ohio and Indiana. It begins at the Ohio-Pennsylvania border. It flows southwesterly between Ohio and Kentucky, Indiana and Kentucky, and continues to the Mississippi River.
none of the rivers form the southern border of Indiana, but the Ohio river forms the southern border of Ohio.
The Ohio River is south of Indiana and forms the boundary between Indiana and Kentucky.
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.
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.
The Ohio River forms the boundary between Indiana and Kentucky.
The Ohio River forms the boundary between Indiana and Kentucky.