The Teays continued northward to Chillicothe, where it disappears under a layering of Wisconsin drift.[2] From Chillicothe, the Teays Valley can be traced in a northwesterly direction past Andersonville, crossing the southwestern part of Pickaway County, past Atlanta. From there, it crosses the northeast corner of Fayette County near Waterloo, extending in a northwesterly direction past London in Madison County, to Vienna in Clark County. Here the Teays was joined by the Groveport River, which drained central Ohio.