Tandy Hills Natural Area was created in 1987.
The area of Tandy Hills Natural Area is 647,497.027584 square meters.
The area of Pedlar Hills Natural Area Preserve is 2,614,269.2488704002 square meters.
Hoffman Hills State Recreation Area was created in 1980.
Mississippi Hills National Heritage Area was created in 2009.
The Channels Natural Area Preserve was created in 2008.
Snyder Middleswarth Natural Area was created in 1921.
Tideman Johnson Natural Area was created in 1940.
Union Bay Natural Area was created in 1972.
Dukes Research Natural Area was created in 1974.
Sielbeck Forest Natural Area was created in 1998.
Volo Bog State Natural Area was created in 1970.
Hill Country State Natural Area was created in 1984.