
The Illinois River dominates this landscape at the confluence of several distinct drainage systems, defining the border between Calhoun and Greene counties. West of the river, the settlement of Hardin serves as a focal point near the Gaging Station, while the river itself is carved into complex channels like Dark Chute and Light River Chute. These waterways separate several large landmasses, including Hurricane Island and Diamond Island, which are managed as state fish and waterfowl areas.
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