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is that Philly is in the transition zone from the Atlantic Coastal Plain (that encompasses most of South Jersey) to the Piedmont, where as you head west from Broad St., there is an elevation rise.



So as you go from the Delaware River east of Broad St., say along parts of Columbus Blvd near Penn's Landing that is actually below sea level, and move west, you will find that places like here in NW Philly and surrounding 'burbs, are where the elevation "soars" to the 300 ft- 400+ ft range, and you are now in an old hilly area.