name: The Knobbs
natural: beach
surface: sand
alt_name: Nobbs
source:name: https://web.archive.org/web/20201123184245/https://ipswich.files.wordpress.com/2020/08/plum-island-the-way-it-was.pdf
source:alt_name: https://books.google.com/books?id=WORrtWTj6Q8C&ots=FF6d-I0JPx&dq=%20Migrations%20of%20the%20Horseshoe%20Crab%2C%20Limulus%20Polyphemus%2C%20in%20Plum%20Island%20Sound%2C%20Massachusetts&lr&pg=PA11#v=onepage&q&f=false
