
The ridge-and-valley terrain of central Pennsylvania dominates this late-19th-century landscape, where the jagged heights of Peters Mountain, Stony Mountain, and Sharp Mountain create formidable natural barriers. Between these summits, narrow water gaps like Swatara Gap and Indiantown Gap serve as essential corridors for transport and settlement. The Philadelphia and Reading Railroad Schuylkill and Susquehanna Branch follows the path of Stony Creek through the mountains, while the Lebanon Valley Branch connects established towns like Hummelstown, Palmyra, and Annville across the flatter agricultural lands to the south.
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