For the more information about the air resources of the National Park Service, please visit http://www.nature.nps.gov/air/.
The Mima Mounds area is a prairie containing unusual soil pimples of black silt-gravel. The mounds range in height from barely perceptible to a maximum of seven feet.
Location: Thurston County, WA
Year designated: 1966
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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