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Pere Marquette State Park in Jersey County, Illinois is Illinois' largest, natural landscape state park. This field guide to the park, the first comprehensive and illustrated guide to any Illinois state park, introduces readers to the fascinating history and rich ecology of the park. On its west side, the eight-thousand-acre landscape is bounded by the Illinois River near its confluence with the Mississippi, and it is situated on one of the state's few unglaciated regions, while the rugged topography exposes ancient geology and supports a diversity of forests and prairies.