Thank you Bob Hill and Nordecker, My connection to that area is just that I used to deer hunt in Cecil County (Maryland) on the eastern shore of the Chesapeake. I loved that place. The name 'MarySee' is derived from my two kids' names, Mary and Christian. The "See" is Christians first initial = "MarySee".
Not sure what that island was, I copied the map from an old, old woodcut map (1740's or so I think). It isn't identified but looks to be part of Elizabeth County.