List of National Natural Landmarks in Ohio

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From List of National Natural Landmarks, these are the National Natural Landmarks in Ohio. There are 23 in total.

Name Image Date Location County Ownership Description
1 Arthur B. Williams Memorial Woods 1974 Cleveland Cuyahoga municipal A remarkably pristine remnant beech-maple forest
2 Blacklick Woods Blacklick Woods Winter.jpg 1974 Fairfield county An outstanding example of relatively undisturbed, old-growth beech-maple and swamp forest communities
3 Brown's Lake Bog Brown Lake Bog.jpg 1967 Wayne private One of the few well-preserved, virgin boreal acid bogs remaining in a region where wetlands have been drained for agricultural use.
4 Buzzardroost Rock, Lynx Prairie, The Wilderness 1967 Adams private Supports many rare or uncommon species and it has an almost 50- year history of scientific observations.
5 Cedar Bog Cedar Bog Ohio Trail.JPG 1967 Urbana Champaign state An excellent example of a marl swamp. Part of Cedar Bog State Nature Preserve.
6 Clear Fork Gorge 1967 Ashland state Clearly illustrates evidence of stream reversal due to the Wisconsin glacier. Located in Mohican State Park.
7 Clifton Gorge Clifton Gorge P4260050.jpg 1967 Greene state Exemplary of interglacial and postglacial canyon-cutting into the dolomites of the Niagara Escarpment. Part of Clifton Gorge State Nature Preserve.
8 Crall Woods 1974 Ashland private A near-virgin remnant of maple-basswood-beech forest-type.
9 Cranberry Bog 1968 Licking state The only known bog of its type in existence. Part of Cranberry Bog State Nature Preserve.
10 Dysart Woods Dysart Woods 1967 Belmont Belmont state One of the finest remaining examples of the white oak forests of eastern Ohio. Managed by Ohio University.
11 Fort Hill State Memorial Fort Hill State Memorial 1974 Hillsboro39°06′47″N 83°24′23″W / 39.1131°N 83.4063°W / 39.1131; -83.4063 (Fort Hill State Memorial) Highland state Excellent outcrops of Silurian, Devonian, and Mississippian sedimentary bedrock and a natural bridge.
12 Glacial Grooves State Memorial 1967 Erie state Very large limestone glacial grooves.
13 Glen Helen Natural Area Orators Mound.jpg 1965 Yellow Springs Greene private Includes a waterfall that carved a large travertine bowl around its pool.
14 Goll Woods Tiffin River at Goll Woods State Nature Preserve in Ohio.jpg 1974 Fulton state One of the best remaining examples of an oak-hickory dominated forest in Ohio. Part of Goll Woods State Nature Preserve.
15 Hazelwood Botanical Preserve 1974 Hamilton state Highly detailed study of the site’s plant ecology was published in 1929. Managed by the University of Cincinnati.
16 Highbanks Natural Area Highbank Park Works from crossing.jpg 1980 Delaware, Franklin county A forested bluff overlooking the Olentangy River.
17 Holden Natural Area 1967 Geauga, Lake private A complex of three natural areas.
18 Hueston Woods 1967 Butler, Preble state A noteworthy example of beech-maple climax forest that has never been cut. Located in Hueston Woods State Park.
19 Mantua Swamp 1976 Portage private Contains many different wetland communities.
20 Mentor Marsh 1964 Lake state Consists of marsh vegetation, aquatic plants, swamp and bottomland forest, and upland forest. Part of Mentor Marsh State Nature Preserve.
21 Serpent Mound Cryptoexplosive Structure 1980 Adams, Highland, Pike private A structure of undetermined origin exposed by differential erosion.
22 Tinkers Creek Gorge 1967 Cuyahoga municipal Contains a virgin oak-hickory and virgin beech-maple-hemlock forest.
23 White Pine Bog Forest 1976 Geauga municipal, private The only remaining near-virgin remnant white pine boreal bog in Ohio.