title: Ohio River (river, United States) -- Britannica Online Encyclopedia
description: Ohio River (river, United States), major river artery of the east-central United States. Formed by the confluence of the Allegheny and Monongahela rivers at Pittsburgh, it flows northwest out of Pennsylvania, then in a general southwesterly direction to join the Mississippi River at Cairo, Illinois (see ), after a course of 981 miles...
title: Appalachian Mountains - Profile of the Appalachian Mountains
description: The Appalachian Mountain Range is an ancient band of mountains that stretches in a southwestern arc from the Canadian province of Newfoundland to central Alabama, the heart of southeastern United States.
title: Cuyahoga Valley National Park (U.S. National Park Service)
title: Shaping the Land - Ohio History Central - A product of the Ohio Historical Society
description: During the past two million years, glaciers have shaped and reshaped the surface of Ohio several times. These continental masses of ice affected as much as two-thirds of the state. Moving from the north and northwest, glaciers have scraped and flattened the landscape. Often more than a mile thick, they smoothed existing hills and filled valleys with enormous amounts of rocks, gravel, and smaller particles.
title: Ohio River - Ohio History Central - A product of the Ohio Historical Society
description: The Ohio River is formed by the confluence of the Allegheny and Monongahela rivers at modern-day Pittsburgh, Pennsylvania. It ends approximately 900 miles downstream at Cairo, Illinois, where it flows into the Mississippi River.
title: Natural Regions - Ohio History Central - A product of the Ohio Historical Society
description: The surface of Ohio includes bedrock from two of the major North American regions. The eastern part of the state lies within the hilly, Appalachian region. The western part of the state is part of the flatter Central Lowlands. The ancient glaciers that bulldozed their way over approximately two-thirds of Ohio had a tremendous effect on the state's bedrock surface. Because of that, the state has five, distinct natural regions.
title: Ohio State Parks - StateParks.com
description: Listing of Ohio State Parks. Details information includes park history, reservation information, maps, camping information, links to nearby attractions, links to lodging, and weather.