National Natural Landmarks Program
The National Natural Landmarks Program (NNL) recognizes and encourages the conservation of sites that contain outstanding biological and geological resources, regardless of landownership type. It is the only natural areas program of national scope that recognizes the best examples of biological and geological features in both public and private ownership. NNL sites are owned by a variety of land stewards and participation in the program is voluntary.
National Natural Landmarks are selected for their outstanding condition, illustrative value, rarity, diversity, and value to science and education. Sites are designated by the Secretary of the Interior, with landowner concurrence, and to-date, nearly 600 landmarks have received the NNL designation within the United States, American Samoa, Guam, Puerto Rico, and the U.S. Virgin Islands. 
Visit the National Natural Landmarks website to learn more. 

Last updated: October 31, 2019