For the more information about the air resources of the National Park Service, please visit http://www.nature.nps.gov/air/.
Iona Island Marsh
Iona Island Marsh is a brackish estuarine marsh in a near natural state that fringes the Hudson River. The site also contains many rare plants.
Location: Rockland County, NY
Year designated: 1974
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