There are 30 National Natural Landmark sites located within the state of Indiana. Natural features represented include bogs, fens, marshes, and dune systems along Lake Michigan, fossil reefs in large river ecosystems, canyons, springs, and caves in an area of karst topography, and diverse and rare forest ecosystems. The sites in Indiana received NNL designation between 1965 and 1986. Sites range in size from 28 acres to over 1500 acres, and are owned by a variety of landowners including U.S. Forest Service, National Park Service, Indiana Department of Natural Resources, Purdue University, non-profit land trusts, Evansville City Parks, The Nature Conservancy and private individuals.
Below is a map of sites in Indiana.
National Natural Landmark sites are located in the following counties: Crawford, Fayette, Floyd, Fountain, Gibson, Harrison, Jefferson, La Porte, Lagrange, Lake, Lawrence, Montgomery, Orange, Owen, Parke, Porter, Putnam, Randolph, Shelby, Spencer, Vanderburgh, and Wabash.
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.