Iron County is home to thirteen designated State Natural Areas (SNAs). From the Wisconsin DNR:
State natural areas (SNAs) protect outstanding examples of Wisconsin’s native landscape of natural communities, significant geological formations and archeological sites. Encompassing 402,000 acres on lands owned by the state and its many partners, including land trusts, local and county governments, and private citizens, Wisconsin’s natural areas are valuable for research and educational use, the preservation of genetic and biological diversity and for providing benchmarks for determining the impact of use on managed lands. They also provide some of the last refuges for rare plants and animals. — https://dnr.wi.gov/topic/lands/naturalareas/
Hiking, paddling, fishing and hunting area allowed on most SNAs, although most do not have developed trails or boat landings. The Wisconsin DNR maintains a list of all the state natural areas by county. Click here to see the Iron County list.
A map of all SNAs in Wisconsin can also be found at the DNR website (PDF).