
Jacks Mountain and Shade Mountain dominate this central Pennsylvania landscape, defining a series of narrow valleys where agriculture and industry settled along the water gaps. The Juniata River carves through these ridges at Mifflintown, creating a transportation corridor shared by the Pennsylvania RR and early highways. This river-and-rail economy is anchored by the borough of Port Royal and industrial points like Cuba Mills and Jericho Mills, where the flow of local streams provided power for early milling operations.
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