<P> Pennsylvania has 229.6 miles ( 369.5 km ) of the trail , extending from the Pennsylvania - Maryland border at Pen Mar , a tiny town straddling the state line , to the Delaware Water Gap , at the Pennsylvania - New Jersey line . The Susquehanna River is generally considered the dividing line between the northern and southern sections of the Pennsylvania AT . The AT crosses the Susquehanna via the Clarks Ferry Bridge , near Duncannon . </P>
where does the appalachian trail cross the susquehanna river
between the northern and southern sections of the Pennsylvania AT