
The confluence of the Ohio River and Mississippi River creates a dynamic landscape where Fort Defiance State Park sits at the very tip of the Illinois-Missouri-Kentucky border. This 1969 topographic study captures a complex system of levees and river-born terrain, including the prominent Angelo Towhead and several deep water pockets such as Deans Blue Hole and Tom Bird Blue Hole. The Missouri side is marked by the agricultural settlements of Wyatt, Wilson City, and Alfalfa Center, illustrating the region's reliance on fertile bottomlands protected by extensive embankments.
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