[ISHMap-List] strange boundary in North America

[Jay L]

William Berry's 1681 map, "North America Divided into its Principall Parts
where are distinguished the severall States which belong to the English,
Spanish and French . ."
shows a peculiar boundary between Carolina and Florida. Although this was
an English-produced map, it obviously does not favor English claims for
Carolina's territory. It is marked with blue arrowheads on the image at this URL:
http://blog.ncmaps.org/wp-content/uploads/2016/02/1681BerryBoundary.jpg <http://blog.ncmaps.org/wp-content/uploads/2016/02/1681BerryBoundary.jpg>

It seems similar but, more “purposeful” than the boundary between Virginia and Florida
 on Jansson’s 1641 America Septentrionalis. Is there a historical basis for this
strange boundary, or is it just a random creation of the cartographer?

Thanks in advance for enlightening me.

Jay Lester
North Carolina Map Blog <http://blog.ncmaps.org/ <http://blog.ncmaps.org/>>

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