Ohio is in the Midwest region of the USA. The State has natural boundaries to the north (Lake Erie) and to the south (Ohio River) and is bordered by the states of Indiana, Kentucky, Michigan, Pennsylvania and West Virginia. Ohio also shares Lake Erie as a border with the Canadian province of Ontario.
The terrain is generally flat in the northwestern parts due to ancient glaciers, and gradually gets hillier as one heads east and southeast toward the Allegheny and Appalachian mountain ranges.
Aside from a Great Lake (Erie) and a major navigable river (Ohio), the State of Ohio offers a national park (Cuyahoga Valley), a national forest (Wayne), a number of National Wildlife Refuges, and a bundle of islands on Lake Erie.