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Constitution Marsh ̽»¨¾«Ñ¡ Center and Sanctuary is a unique and beautiful tidal marsh located in Putnam County, New York, and serves as vital natural habitat in the Hudson River Estuary. It is situated on the east shore of the Hudson River, just south of the village of Cold Spring. The marsh is an Ì½»¨¾«Ñ¡ New York Important Bird Area, a , and is designated as a Significant Coastal Fish and Wildlife Habitat.