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The westernmost ridges are considered to be the Laurel Highlands and Chestnut Ridge in Pennsylvania, and Laurel Mountain and Rich Mountain in West Virginia. Big Stone Ridge marks the southern extent of the Alleghenies and is an outlier of Flat Top Mountain , with the Tug Fork river running along its western flank. [ 6 ]
1751 map depicting the "Yawyawganey River" (top-left corner) In the colonial era and in the early United States, the valley of the river provided an important route of access through the mountains for settlers and military forces from Virginia to western Pennsylvania and the Ohio Country.
[b] But a few major rivers, such as the Delaware River, the Susquehanna River, the New River, and the Potomac River, are evidently older than the present mountains, having cut water gaps that are perpendicular to hard strata ridges. The evidence points to a wearing down of the entire region (the original mountains) to a low level with little ...
The Allegheny River (/ ˌ æ l ɪ ˈ ɡ eɪ n i / AL-ig-AY-nee) is a 325-mile-long (523 km) tributary of the Ohio River that is located in western Pennsylvania and New York in the United States.
USGS Hydrologic Unit Map - State of Pennsylvania (1974) Shaw, Lewis C. (June 1984). Pennsylvania Gazetteer of Streams Part II (Water Resources Bulletin No. 16). Prepared in Cooperation with the United States Department of the Interior Geological Survey (1st ed.).
Named features in image include Flat Rock, Mount Dempsey, Bloserville, and Bowers Mountain. The valley is bound to the west and north by the Ridge-and-Valley Appalachians (Bear Pond Mountains/Blue Mountain), to the east and south by South Mountain, to the northeast by the Susquehanna River at Harrisburg, and to the south by the Potomac River.
The highest point in Pennsylvania, Mount Davis, reaches 3,213 feet (979 m), and is located near the southern border of the state in Somerset County, approximately 100 miles (160 km) east of the southwestern corner, where the Appalachian Mountains enter Pennsylvania from the south. [2]
The Tygart Valley River rises in the Allegheny Mountains in Pocahontas County and flows generally north-northwestwardly through Randolph, Barbour, Taylor and Marion counties, past the towns of Huttonsville, Mill Creek, Beverly, Elkins, Junior, Belington, Philippi, Arden, and Grafton, to Fairmont, where it joins the West Fork River to form the Monongahela River. [6]