Great Valley (Pennsylvania)
The Great Valley is a west-to-east valley through the center of Chester County, Pennsylvania, United States. It is also sometimes referred to as Chester Valley, and both names are in use throughout the region. The valley stretches from the Schuylkill River in Montgomery County in the east, southwesterly through Chester and Lancaster counties. The valley is most distinct in central Chester County, although traces of it can be followed almost the entire distance between the Delaware and Susquehanna rivers.
Valley Creek flows along the base of eastern Great Valley, towards the Schuylkill River. A second creek, also named Valley Creek, flows westward from Frazer into the East Branch Brandywine Creek. Beaver Creek flows eastward along the northern side of the valley from around Thorndale into the East Branch Brandywine Creek. Multiple branches of both the Brandywine and Octoraro creeks cross the valley.
The Great Valley forms a natural route to the west from the Philadelphia area. Both the Pennsylvania Turnpike and U.S. Route 202 follow the eastern portion of the valley. U.S. Route 30 enters the valley around Malvern and serves as the main thoroughfare in the valley as far west as Coatesville, where Pennsylvania Route 372 becomes the main road along the valley to its western end. The Great Valley is also served by Amtrak and SEPTA rail service for much of its length.
- E.g., Erwin Raisz, Landforms of the United States, 6th rev. ed. 1957.
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