
The Mississippi River creates a dynamic border between Alexander County, Illinois, and Scott County, Missouri, in this mid-1990s survey. The river's influence is evident in the complex network of side channels and islands, such as Burnham Island and Goose Island, separated by chutes like Santa Fe Chute and Doolan Chute. On the Illinois side, the riverbank is dominated by the Santa Fe Hills within the Shawnee National Forest, where numerous hollows like Black Powder Hollow and Dynamite Hollow suggest a history of industrial or explosive storage use tucked into the terrain.
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