National Natural Landmarks
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. NNLs are owned by a variety of public and private entities and allowing visitation is at their discretion. Many NNL sites maintain public websites where additional information may be found.