British Fortification - Boston Neck Lines - "Tied Island"

This ran along the west coast of the Shawmut Peninsula then across the isthmus to the east coast. Technically Boston was a "tied island" connected to land by a sandy spit called a "tombolo." These fortification lines ran down almost to Marginal Rd then across the middle of the block between Marginal and Oak St then up through Oak Terrace Appartments just shy of Maple Place. (see map for details and second link for more about how Boston filled in)

https://www.nps.gov/articles/000/siege-of-boston-map.htm

https://www.wbur.org/news/2021/06/14/8-maps-that-explain-bostons-changing-shoreline