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
The Channels Natural Area Preserve was created in 2008.
Snyder Middleswarth Natural Area was created in 1921.
Tandy Hills Natural Area was created in 1987.
Tideman Johnson Natural Area was created in 1940.
Union Bay Natural Area was created in 1972.
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.
Cornwall Area of Outstanding Natural Beauty was created in 1959.