Thank you very much to all :)
Barry+Roger contributions sorted the problem for the moment, although in my
mind there are still things to be understood.
Mike, yep, thank you for alerting me of rnaturalearth issues- I was not
aware of it. In this case, I am really interested in the process to
apply in other polygons, not in the data *per se*, but will take this into
account in the future.
Once I have the doc produced (distribution of world
estuaries/bays/transition waters), I will post on the list :)
Best wishes,
M.
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