List of National Natural Landmarks in Ohio

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

AB Williams Memorial Woods
Clear Fork Gorge
Clifton Gorge
Crall Woods
Cranberry Bog
Glacial Grooves State Memorial
Highbanks Natural Area
Mentor Marsh
Ohio National Natural Landmarks (clickable map)
Name Image Date Location County Ownership Description
1 Arthur B. Williams Memorial Woods 1974 41.562282°N 81.426792°W / 41.562282; -81.426792 (Arthur B. Williams Memorial Woods) Cuyahoga municipal A remarkably pristine remnant beech-maple forest
2 Blacklick Woods 1974 39.937222°N 82.807778°W / 39.937222; -82.807778 (Blacklick Woods) Fairfield county An outstanding example of relatively undisturbed, old-growth beech-maple and swamp forest communities
3 Brown's Lake Bog 1967 40.6809°N 82.0624°W / 40.6809; -82.0624 (Brown's Lake Bog) 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 38.759381°N 83.407013°W / 38.759381; -83.407013 (Lynx Prairie) Adams private Supports many rare or uncommon species and it has an almost 50- year history of scientific observations.
5 Cedar Bog 1967 40.059444°N 83.795556°W / 40.059444; -83.795556 (Cedar Bog) Champaign state An excellent example of a marl swamp. Part of Cedar Bog State Nature Preserve.
6 Clear Fork Gorge 1967 40.610982°N 82.286827°W / 40.610982; -82.286827 (Clear Fork Gorge) Ashland state Clearly illustrates evidence of stream reversal due to the Wisconsin glacier. Located in Mohican State Park.
7 Clifton Gorge 1967 39.793903°N 83.831525°W / 39.793903; -83.831525 (Clifton Gorge) 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 41.028219°N 82.434376°W / 41.028219; -82.434376 (Crall Woods) Ashland private A near-virgin remnant of maple-basswood-beech forest-type.
9 Cranberry Bog 1968 39.931545°N 82.468232°W / 39.931545; -82.468232 (Cranberry Bog) Licking state The only known bog of its type in existence. Part of Cranberry Bog State Nature Preserve.
10 Dysart Woods 1967 39.9846°N 80.9976°W / 39.9846; -80.9976 (Dysart Woods) 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 1974 Hillsboro39.1131°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 41.616304°N 82.70652°W / 41.616304; -82.70652 (Glacial Grooves State Memorial) Erie state Very large limestone glacial grooves.
13 Glen Helen Natural Area 1965 39.804125°N 83.881697°W / 39.804125; -83.881697 (Glen Helen Natural Area) Greene private Includes a waterfall that carved a large travertine bowl around its pool.
14 Goll Woods 1974 41.554294°N 84.361738°W / 41.554294; -84.361738 (Goll Woods) 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 1980 40.143889°N 83.028333°W / 40.143889; -83.028333 (Highbanks Natural Area) 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 39.5725°N 84.741389°W / 39.5725; -84.741389 (Hueston Woods) 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 41.280278°N 81.211389°W / 41.280278; -81.211389 (Mantua Swamp) Portage private Contains many different wetland communities.
20 Mentor Marsh 1964 41.729164°N 81.305492°W / 41.729164; -81.305492 (Mentor Marsh) 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 39.033333°N 83.4°W / 39.033333; -83.4 (Serpent Mound crater) Adams, Highland, Pike private A structure of undetermined origin exposed by differential erosion.
22 Tinker's Creek Gorge 1967 41.365°N 81.609722°W / 41.365; -81.609722 (Tinker's Creek Gorge) 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.
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