Where is Plum Island?

Plum Island, Massachusetts is an island located off the northeast coast of Massachusetts, north of Cape Ann. It is a barrier island approximately 11 miles (18 km) in length.

Plum Island appears as an unnamed island as early as Captain John Smith's map of New England. It is named in an act of the General Court of Massachusetts dated 1649, apportioning 2/5 of the island to Newbury (before its division), 2/5 to Ipswich and 1/5 to Rowley.[1] The name is apparently of local origin: the journal of Margaret Smith (1678-9) relates:

"Leaving on our right hand Plum Island, (so-called on account of the rare Plums which doe grow upon it,) we struck into the open Sea...."[2]
A notable historian of the region, Joshua Coffin, said of it in 1845:

"Plum Island, a wild and fantastical sand beach, is thrown up by the joint power of winds and waves into the thousand wanton figures of a snow drift~

Plum Island is a small barrier island just off the extreme northeast coast of Massachusetts and is part of Newbury, Newburyport, Rowley, and Ipswich.
(there may be more than one Plum Island)

plum islands is plum in the middle of things and other islands !