
The Lehigh River corridor serves as the industrial and topographic spine of this region, separating the dense urban grids of Allentown and Bethlehem. At the turn of the millennium, the landscape reveals a complex layering of legacy infrastructure and modern expansion. The Lehigh Canal and Conrail lines trace the riverbanks, reflecting the valley's historic transport heritage, while the steep slopes of South Mountain and Lehigh Mountain provide a natural buffer between the cities and the suburbanizing valley to the south.
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