There are 23 National Natural Landmark sites located within the state of Ohio. Natural features represented include a variety of forest communities and marshes intertwined amongst striking and diverse glacial formations including bluffs, glacial grooves, and gorges. Several NNL sites are research areas, such as Hazelwood Botanical Preserve, at which ecological studies were published from 1929. The sites in Ohio received NNL designation between 1964 and 1980. Sites range in size from 3.5 acres to 12,800 acres and are owned by a variety of landowners including U.S. Forest Service, Ohio Department of Natural Resources, universities and colleges, Ohio Historical Society, Holden Arboretum, Metroparks, Cincinnati Museum, The Nature Conservancy and private individuals.
Below is a map of sites in Ohio.
National Natural Landmark sites are located in the following counties: Adams, Ashland, Belmont, Butler, Champaign, Cuyahoga, Delaware, Erie, Fairfield, Franklin, Fulton, Geauga, Greene, Hamilton, Highland, Lake, Licking, Pike, Portage, Preble, and Wayne.
Please remember, National Natural Landmarks (NNLs) are not national parks. NNL status does not indicate public ownership, and many sites are not open for visitation.