Note 22:

Sotaque do norte

It seems the pronunciation of Portuguese in Portugal is quite uniform. There are few dialects and accents. Of course Mirando do Douro is a special case: it doesn't belong to Portuguese, but to Asturian-Leonese, the national border doesn't strictly follow the language borders here.
Alentejo allegedly has it own dialects, but I have nothing sensible to say about them.
Then there is the accent of the north of Portugal. Some traits (based on incomplete evidence):

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