About
LocationNY
RegionSuffolk County
Managed byNew York State DEC
SizeLarge — multiple days
Acres3,244 acres

Caumsett State Historic Park Preserve is a state park on Lloyd Neck, a peninsula extending into the Long Island Sound, in the Village of Lloyd Harbor, New York, United States. It is operated by the New York State Office of Parks, Recreation and Historic Preservation. The 1,680-acre park covers the former Marshall Field III estate, developed in the 1920s and was listed on the National Register of Historic Places in 1979. Most of the grounds of the former Seminary of the Immaculate Conception were acquired in 2026. Much of the park is managed as a nature preserve to protect high-quality bird habitats.

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