The Rio Grande.
Ohio 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 Rio Grande river
The Ohio River and Ohio River Valley boarder the southern part of Ohio.
Columbia
Rio grande
It is the boarder of Texas and Mexico.
The Red River forms Oklahoma's southern border with Texas.
The Rio Grande River
The Ohio River
The Red River forms most of Oklahoma's southern border with Texas east of the panhandle. It is also known as the Red River of the South.
The River that forms a border between Oklahoma and Texas is the Red River. The river was named for the red-bed country of its watershed.