Monomoy is a barrier island located off the coast of Cape Cod, Massachusetts. It is part of the Monomoy National Wildlife Refuge, which was established to protect the diverse wildlife and habitats found in the area. The island is known for its sandy beaches, salt marshes, and tidal flats, making it an important habitat for various bird species, including the endangered piping plover. The island is accessible by boat and is popular for outdoor activities such as fishing, birdwatching, and kayaking. Monomoy's unique ecosystem supports a variety of marine life, and its waters are often frequented by seals and other marine mammals. The area is also significant for its historical and cultural heritage, with evidence of Native American presence and early European settlement.