Constitution Marsh Audubon Center and Sanctuary is a tidal marsh in Putnam County, New York, that serves as crucial natural habitat in the Hudson River Estuary. It is located on the east shore of the Hudson River, south of the village of Cold Spring. The marsh is part of Hudson Highlands State Park and is one of five major tidal marshes along the Hudson River. The marsh is a New York State Bird Conservation Area, an Audubon New York Important Bird Area and a Significant Coastal Fish and Wildlife Habitat. Audubon Center organizes nature education programs for visiting groups, researchers doing bird studies, habitat restoration efforts and invasive species management. There are hiking trails that lead to a 700-foot boardwalk that runs through the marsh.

127 Warren Landing Rd, Garrison, NY 10524, Phone: 845-265-2601

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