The Teays River was a north- and northwest-flowing river existing before the Pleistocene Ice Ages – before 2.5 million years ago.[10] The Teays flowed through southwest West Virginia, between Kentucky and Ohio, and northwest across Ohio (see illustration).[11] The Teays then flowed under what is present-day Lafayette, Indiana and just north of Champaign, Illinois, and likely was coincident with the lower present-day Illinois River.