This section of the AT runs 20.7 miles from Swatara Gap to PA Hwy 183. Along the way the trail passes PA Hwy 72, I-81, Little Mountain, the William Penn shelter, PA Hwy 645, PA Hwy 501, the 501 shelter, and Summer Hill.
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http://www.tripleblaze.com/trail.php?c=3&i=2415