You can’t see it because this is a photo from a book that was released back in like 2013 with a ton of various images that more better utilized the colors.
Example:
OP’s image must have been stolen and reuploaded again and again and again to get us where we are today.
I’m from the green zone but it should be blue honestly. Where even is the blue on this map?
There’s a tiny community in Wisconsin that has the Delco accent. It’s there.
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It’s spelled wooder.
You can’t see it because this is a photo from a book that was released back in like 2013 with a ton of various images that more better utilized the colors.
Example:

OP’s image must have been stolen and reuploaded again and again and again to get us where we are today.
Not just that, there is a neat quiz that tries to predict where you are from, based on how you pronounce various words!
https://www.nytimes.com/interactive/2014/upshot/dialect-quiz-map.html
(I see that it is now behind a paywall… 😞)
Why is blue in the key when there’s no blue on the map?
Probably a city that is too hard to make out with so few pixels. I would assume Boston, because it would be Boston.
Or maybe they included it because some areas have marry pronounced differently, but forgot to include one for Mary being pronounced differently.