The region roughly encompasses the portion of Ohio East of Columbus and North of Interstate 70. It has over 122 parks and conservatories including the Cuyahoga Valley National Park - the only National Park in Ohio. There are 1000 miles of hiking trails and paths through its predominately wooded foothills of the Allegheny Mountain range which subside as they approach Lake Erie and as one goes Southwest toward Columbus. Portions of these include the historic Ohio and Erie Canal system. That said there are many undiscovered crags in the region.
Sandstone is the primary rock type, with shale, conglomerates, and limestone in lesser quantities. Clay and in some areas makes wet weather climbing dubious.
As with most climbing in Ohio, if the route is not cleaned frequently it probably has moss or lichen on it. Do everyone a favor and clean your chalk or use eco-chalk.