2021 Map of Illinois City

About this map

The Mississippi River creates a complex border between Iowa and Illinois in this 2021 survey, winding past a series of named landforms including Geneva Island, Hershey Island, and Andalusia Island. These river features are separated from the mainland by secondary channels such as Wyoming Slough and Andalusia Slough, reflecting a dynamic hydrologic environment. Small communities and rural clusters like Sweetland Center, New Era, and Fairport anchor the Iowa side, while Illinois City sits atop the bluffs across the water.