For the more information about the air resources of the National Park Service, please visit http://www.nature.nps.gov/air/.
Willcox Playa, the largest "dry lake" in Arizona, is a remnant of the pluvial Lake Cochise. Unlike similar dry lakes, the black mud below the surface contains a rich fossil pollen record of the pluvial periods of the Pleistocene. The site has become a night-time roosting area for 4,000-8,000 sandhill cranes and contains the greatest diversity of tiger beetles in the United States.
Location: Cochise County, AZ
Year designated: 1966
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.
Last Updated: June 28, 2012