Satellite image of Ohio -
Note glaciated western Ohio and northeast Ohio. Unglaciated southeast Ohio.
Note the remnant of the ancient, pre-glacial Teays River Valley just east of the Scioto River Valley in southern Ohio. It comes up from the Ohio River and joins the Scioto Valley near Waverly. It flowed north across Ohio toward today's Indiana.
Note the extent of the glacier with the large lobes ending near Chillicothe and Cincinnati.
One can also see the highest elevation in Ohio at Campbell Hill in western Ohio surrounded by the glacial till plain.
As the glacier retreated it left large deposits of sand and gravel known as moraines. They can be seen like waves across the western Ohio landscape