Fenwick Island State Park is a 344-acre Delaware state park between Ocean City, Maryland and South Bethany, Delaware in Sussex County, Delaware, US. Originally part of Delaware Seashore State Park, it was established in 1966 and renamed in 1981. The park is located on Fenwick Island, a narrow strip of land between the Atlantic Ocean and Little Assawoman Bay. It is largely undeveloped in comparison to the beach communities that surround it.