Flax Pond Beach, located in Old Field, New York, is a unique tidal estuary on the north shore of Long Island. It is not a traditional beach but rather a 146-acre salt marsh known for its biodiversity and natural beauty. The area is owned by the New York State Department of Environmental Conservation and is used for both research and recreational activities. Visitors can explore the marsh via a short accessible trail and a boardwalk, offering views of the surrounding wetlands and wildlife such as fiddler crabs and various bird species.
The beach itself is not suitable for swimming but offers a scenic walk along the Long Island Sound shoreline. The nearby Flax Pond Marine Lab, operated by Stony Brook University, conducts marine research and provides educational programs.
The area's history is rich, having once been a freshwater pond before being connected to the Long Island Sound in the early 19th century. Today, it serves as a valuable environmental sanctuary and educational site.