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Red river is part of Oklahoma's southern border.
The Zambezi River is on the southern border of Zambia.
The Ohio River
The Ohio River formed the southern border of the Northwest Territory.
The river that shares the southern border of Oklahoma is the Red River.
The southern border of Indiana is the OHIO River (which separates it from Kentucky.)
The Red River.
Ohio River
The Ohio River.
The Red River.
The river that flows from the Texas panhandle by the border of Louisiana is the "Red River." There is also a river in the northwestern states also called the "Red River," but don't get confused.
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.