
The Mississippi River defines the western edge of this landscape where Mercer County, Illinois, meets Louisa County, Iowa. The river valley is dominated by the Upper Mississippi River Wild Life and Fish Refuge, featuring riparian landmarks like Corsepius Island and a network of embankments including a Dike line. Inland, the terrain is shaped by the Edwards River and Pope Creek, which cut through a predominantly agricultural region organized into townships such as New Boston and Millersburg.
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