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[]: 19
[Name]: Mantua Swamp
[Image]:
[Date]: 1976
[Location]: 41°16′49″N 81°12′41″W / 41.280278°N 81.211389°W / 41.280278; -81.211389 (Mantua Swamp)
[County]: Portage
[Ownership]: private
[Description]: Contains many different wetland communities. -
[]: 23
[Name]: White Pine Bog Forest
[Image]:
[Date]: 1976
[Location]:
[County]: Geauga
[Ownership]: municipal, private
[Description]: The only remaining near-virgin remnant white pine boreal bog in Ohio. -
[]: 4
[Name]: Buzzardroost Rock, Lynx Prairie, The Wilderness
[Image]:
[Date]: 1967
[Location]: 38°45′34″N 83°24′25″W / 38.759381°N 83.407013°W / 38.759381; -83.407013 (Lynx Prairie)
[County]: Adams
[Ownership]: private
[Description]: Supports many rare or uncommon species and it has an almost 50- year history of scientific observations. -
[]: 22
[Name]: Tinker's Creek Gorge
[Image]:
[Date]: 1967
[Location]: 41°21′54″N 81°36′35″W / 41.365°N 81.609722°W / 41.365; -81.609722 (Tinker's Creek Gorge)
[County]: Cuyahoga
[Ownership]: municipal
[Description]: Contains a virgin oak-hickory and virgin beech-maple-hemlock forest. -
[]: 21
[Name]: Serpent Mound Cryptoexplosive Structure
[Image]:
[Date]: 1980
[Location]: 39°02′00″N 83°24′00″W / 39.033333°N 83.4°W / 39.033333; -83.4 (Serpent Mound crater)
[County]: Adams, Highland, Pike
[Ownership]: private
[Description]: A structure of undetermined origin exposed by differential erosion. -
[]: 20
[Name]: Mentor Marsh
[Image]:
[Date]: 1964
[Location]: 41°43′45″N 81°18′20″W / 41.729164°N 81.305492°W / 41.729164; -81.305492 (Mentor Marsh)
[County]: Lake
[Ownership]: state
[Description]: Consists of marsh vegetation, aquatic plants, swamp and bottomland forest, and upland forest. Part of Mentor Marsh State Nature Preserve.
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