none of the rivers form the southern border of Indiana, but the Ohio river forms the southern border of Ohio.
The Ohio River
Ohio River
The Ohio River formed the southern border of the Northwest Territory.
The border is the Ohio River.
The Ohio River.
wabash
The border between Ohio and Indiana is approximately 210 miles long. This boundary runs along the state line, with the Ohio River marking part of the southern border of Ohio and the northern border of Indiana. The border is mostly straight, with a few deviations, particularly in the northwestern region.
The Ohio River and Ohio River Valley boarder the southern part of Ohio.
Ohio River
The southern border of Indiana is the OHIO River (which separates it from Kentucky.)
It's along the southern border, between Ohio and West Virginia/Kentucky. The southern edge of the state is defined by the river.