| Cache River State Natural Area | |
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IUCN category Ib (wilderness area)
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Taxodium distichum in Heron Pond
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Map of the U.S. state of Illinois showing the location of Cache River State Natural Area
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| Location | Johnson County, Illinois, USA |
| Nearest city | Belknap, Illinois |
| Coordinates | 37°21′44″N 88°57′20″W / 37.36222°N 88.95556°WCoordinates: 37°21′44″N 88°57′20″W / 37.36222°N 88.95556°W |
| Area | 14,314 acres (5,793 ha) |
| Established | 1970 |
| Governing body | Illinois Department of Natural Resources |
Cache River State Natural Area is an Illinois state park on 14,314 acres (5,793 ha) in Johnson County, Illinois, United States.