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The Allegheny Plateau (/ ˌ æ l ɪ ˈ ɡ eɪ n i / AL-ig-AY-nee) is a large dissected plateau area of the Appalachian Mountains in western and central New York, northern and western Pennsylvania, northern and western West Virginia, and eastern Ohio. It is divided into the unglaciated Allegheny Plateau and the glaciated Allegheny Plateau.
The Ohio River roughly bisects the Unglaciated Allegheny Plateau in generally a north-northeast to south-southwest direction. Other significant rivers in the plateau include the Muskingum River and Tuscarawas River in Ohio, the Youghiogheny River and Allegheny River in Pennsylvania, and the Monongahela River and Kanawha River in West Virginia.
In general, the glaciated lies to the north and west of the unglaciated, and forms an arc in northeastern to southeastern Ohio lying between the glacial till plains and the Unglaciated Allegheny Plateau. The Glaciated Allegheny Plateau extends into a belt of southern New York State and the central Susquehanna River basin. A small area of the ...
A 1775 map of the Allegheny Plateau and Mountain Range. Trans-Allegheny travel had been facilitated when a military trail—Braddock Road—was blazed and opened by the Ohio Company in 1751. (It followed an earlier Indian and pioneer trail known as Nemacolin's Path.)
Derwent lies in southeastern Ohio, a part of the Unglaciated Allegheny Plateau region. It is located about seven miles from Senecaville Lake . State Route 313 (Clay Pike Road) runs on the southern edge of Derwent, and its interchange with Interstate 77 is a little over 1 mile (1.6 km) away.
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Rough map of the Portage Escarpment (black line) in New York, Pennsylvania, and Ohio. The Portage Escarpment is a major landform in the U.S. states of Ohio, Pennsylvania, and New York which marks the boundary between the Till Plains to the north and west and the Appalachian Plateau to the east and south.
Conkle's Hollow. The Hocking Hills is a deeply dissected area of the Allegheny Plateau in Appalachian Ohio, primarily in Hocking County, that features cliffs, gorges, rock shelters, and waterfalls.