The Ohio River
The Ohio River.
none of the rivers form the southern border of Indiana, but the Ohio river forms the southern border of Ohio.
The southern border of Ohio is 981 miles and is defined by the Ohio River. It is also the southern border of Indiana and Illinois.
The Ohio River and Ohio River Valley boarder the southern part of Ohio.
Ohio River
The border is the Ohio River.
wabash
The southern border of Indiana is the OHIO River (which separates it from Kentucky.)
The Ohio River formed the southern border of the Northwest Territory.
It's along the southern border, between Ohio and West Virginia/Kentucky. The southern edge of the state is defined by the river.
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.