Dukes Research Natural Area was created in 1974.
Lost Forest Research Natural Area was created in 1972.
The area of Lost Forest Research Natural Area is 36.26 square kilometers.
William N. Copeland has written: 'Harney Lake Research Natural Area' -- subject(s): Research natural areas 'Stinking Lake Research Natural Area' -- subject(s): Research natural areas
Volo Bog State Natural Area was created in 1970.
The Channels Natural Area Preserve was created in 2008.
Tandy Hills Natural Area was created in 1987.
Sielbeck Forest Natural Area was created in 1998.
Tideman Johnson Natural Area was created in 1940.
Union Bay Natural Area was created in 1972.
Snyder Middleswarth Natural Area was created in 1921.
Hill Country State Natural Area was created in 1984.
Goshen Pass Natural Area Preserve was created in 2001.