For the more information about the air resources of the National Park Service, please visit http://www.nature.nps.gov/air/.
Located within Fairmount Park, the Wissahickon Valley is a symbol of natural area preservation within a vast urban complex. The site provides value in the study of natural landscape evolution from late Tertiary times to the present.
Location: Philadelphia County, PA
Year designated: 1964
For additional information see:
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