
The Cache River lowlands dominate this mid-1960s landscape, where complex drainage systems like the Post Creek Cutoff and Main Ditch reengineered the river's natural course. This intersection of three southern Illinois counties—Johnson, Pulaski, and Massac—reveals a hub of mid-century rail activity, with the Chicago and North Western, New York Central, and Chicago and Eastern Illinois railroads all converging near Karnak.
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