The Susquehanna Valley is a region of low-lying land that borders the Susquehanna River in the U.S. states of New York, Pennsylvania, and Maryland. The valley consists of areas that lie along the main branch of the river, which flows from Upstate New York through Pennsylvania and Maryland into the Chesapeake Bay, as well as areas that lie along the shorter West Branch in Pennsylvania. History and architectural features As of 2014, seventeen of the oldest covered bridges in the United States were located in the Susquehanna Valley. Geography Historians and environmentalists at the Chesapeake Conservancy have described the Susquehanna River as the "lifeblood" of the Chesapeake Bay and also as "extension of the Susquehanna Valley that the Atlantic Ocean has steadily flooded over the last 15,000 years." Within Pennsylvania, the Susquehanna Valley is linked inextricably with the Chesapeake Bay watershed, which extends from Virginia, West Virginia, Washington, D.C. and Maryland through Delaware, Pennsylvania and New York. Pennsylvania's connections to the watershed are "primarily in the counties along the Susquehanna River, the West Branch of the Susquehanna, and their tributaries," according to Shelby Splain. "Located in the middle of the commonwealth, about half of the land in Pennsylvania drains into it." Communities in the valley Main Branch Cities Oneonta, New York Binghamton, New York Wilkes-Barre, Pennsylvania Scranton, Pennsylvania Sunbury, Pennsylvania Harrisburg, Pennsylvania Lancaster, Pennsylvania York, Pennsylvania Havre de Grace, Maryland Counties Otsego County, New York Delaware County, New York Chenango County, New York Broome County, New York Susquehanna County, Pennsylvania Tioga County, New York Bradford County, Pennsylvania Wyoming County, Pennsylvania Lackawanna County, Pennsylvania Luzerne County, Pennsylvania Columbia County, Pennsylvania Montour County, Pennsylvania Potter County, Pennsylvania Tioga County, Pennsylvania Northumberland County, Pennsylvania Snyder County, Pennsylvania Juniata County, Pennsylvania Perry County, Pennsylvania Dauphin County, Pennsylvania Cumberland County, Pennsylvania York County, Pennsylvania Lancaster County, Pennsylvania Cecil County, Maryland Harford County, Maryland West Branch Cities Lock Haven, Pennsylvania Williamsport, Pennsylvania Counties Cambria County, Pennsylvania Clearfield County, Pennsylvania Centre County, Pennsylvania Clinton County, Pennsylvania Lycoming County, Pennsylvania Union County, Pennsylvania Northumberland County, Pennsylvania References External links Barrett, Brenda and Jackie Kramer. "Contact Period Landscapes of the Lower Susquehanna River." Annapolis, Maryland: NPS Chesapeake Bay Office, National Park Service, 2016 (retrieved online February 4, 2023). "Indigenous Peoples of the Susquehanna Valley." The Historical Marker Database, retrieved online February 4, 2023. Landforms of Cambria County, Pennsylvania Landforms of Clearfield County, Pennsylvania Landforms of Centre County, Pennsylvania Landforms