The Teays River is an ancient river system that once flowed through parts of present-day West Virginia, Ohio, and Kentucky. It is believed to have existed during the late Pleistocene epoch, before being buried by glacial deposits. The river's path has significantly influenced the region's geology and hydrology. Today, remnants of the Teays River can be seen in the form of underground channels and valleys. These features provide important insights into the area's geological history and the effects of glaciation. The river is also significant for understanding the evolution of the Ohio River system.