
The Monongahela River carves a deep, serpentine path through this industrial heartland, defining the growth of the coal and steel towns that lined its banks at the turn of the century. Settlements like Monongahela, Charleroi, and Donora are shown in their early industrial prime, densely packed between the river and the steep ridges. The presence of Lock No. 4 highlights the river's vital role as a managed navigation artery for the region's mineral wealth.
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