21 : Susquehanna River|Rivers of Pennsylvania|Rivers of New York (state)|American Heritage Rivers|Tributaries of the Chesapeake Bay|Environment of the Mid-Atlantic states|Allegheny Plateau|Rivers of Bradford County, Pennsylvania|Rivers of Columbia County, Pennsylvania|Rivers of Cumberland County, Pennsylvania|Rivers of Northumberland County, Pennsylvania|Rivers of Montour County, Pennsylvania|Rivers of Luzerne County, Pennsylvania|Rivers of Lackawanna County, Pennsylvania|Rivers of Wyoming County, Pennsylvania|Rivers of Broome County, New York|Rivers of Delaware County, New York|Rivers of Otsego County, New York|Rivers of Schoharie County, New York|Rivers of Tioga County, New York|Rivers of Susquehanna County, Pennsylvania