There are 13 National Natural Landmark sites located entirely or partially within the state of South Dakota. Natural features represented include an excellent, rare example of joint-controlled weathering of granite, one of the largest concentrations of mammoth remains in the U.S., and excellent examples of prairie potholes. Sites were designated over a 15-year period from 1965 to 1980. Sites range in size from four to nearly 8,700 acres and area owned by a variety of landowners including U.S. Forest Service, tribal, state parks, and private organizations and individuals.
Below is a map of sites in South Dakota.
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.