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Downstream from the confluence of its branches it flows south past [[Selinsgrove, Pennsylvania|Selinsgrove]],
where it is joined by its [[Penns Creek, Pennsylvania|Penns Creek]] tributary,
and cuts through a water gap at the western end of [[Mahantongo]] Mountain. It receives the [[Juniata River]] from the northwest at [[Duncannon, Pennsylvania|Duncannon]], then passes through its last water gap, through [[Blue Ridge Mountains|Blue Mountain]] Pennsylvania, just northwest of [[Harrisburg, Pennsylvania|Harrisburg]]. It passes downtown Harrisburg (where it is nearly a [[mile]] wide), the largest city on the lower river, and flows southeast across rural south central Pennsylvania forming the border between [[York County, Pennsylvania|York]] and [[Lancaster County, Pennsylvania|Lancaster]] counties, as well as receiving [[Swatara Creek]] from the northeast. It crosses into northern [[Maryland]] approximately 30 miles northeast of [[Baltimore, Maryland|Baltimore]] and enters the northern end of the Chesapeake Bay at [[Havre de Grace, Maryland|Havre de Grace]].
==Geology==
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