List of National Natural Landmarks in Ohio

Map all coordinates using: OpenStreetMap

Download coordinates as: KML

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			1974	41°33′44″N 81°25′36″W / 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°56′14″N 82°48′28″W / 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°40′51″N 82°03′45″W / 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	, Lynx Prairie,		1967	38°45′34″N 83°24′25″W / 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°03′34″N 83°47′44″W / 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			1967	40°36′40″N 82°17′13″W / 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			1967	39°47′38″N 83°49′53″W / 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			1974	41°01′42″N 82°26′04″W / 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			1968	39°55′54″N 82°28′06″W / 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°59′05″N 80°59′51″W / 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°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			1967	41°36′59″N 82°42′23″W / 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°48′15″N 83°52′54″W / 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°33′15″N 84°21′42″W / 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			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°08′38″N 83°01′42″W / 40.143889°N 83.028333°W / 40.143889; -83.028333 (Highbanks Natural Area)	Delaware, Franklin	county	A forested bluff overlooking the Olentangy River.
17			1967		Geauga, Lake	private	A complex of three natural areas.
18	Hueston Woods		1967	39°34′21″N 84°44′29″W / 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°16′49″N 81°12′41″W / 41.280278°N 81.211389°W / 41.280278; -81.211389 (Mantua Swamp)	Portage	private	Contains many different wetland communities.
20			1964	41°43′45″N 81°18′20″W / 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°02′00″N 83°24′00″W / 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°21′54��N 81°36′35″W / 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			1976		Geauga	municipal, private	The only remaining near-virgin remnant white pine boreal bog in Ohio.