
The Illinois River dominates this landscape as it meanders past Grand Island and through a complex system of backwaters, including Stickey Lake, Anderson Lake, and Swan Lake. Further south, the Sangamon River carves its way through Chandlerville, showing a river system prior to modern engineering, where McHenry Slough and Mud Slough defined the bottomlands. The presence of numerous river landings, such as West Point Landing and Holmes Landing, highlights the era's reliance on the water for transport and commerce.
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