For the more information about the air resources of the National Park Service, please visit http://www.nature.nps.gov/air/.


Baltimore County, MD

Long Green Creek and Sweathouse Branch
Long Green Creek and Sweathouse Branch, a National Natural Landmark in Baltimore County, MD.

National Natural Landmarks in this county include:


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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