https://en.wikipedia.org/wiki/Portuguese_dialects
The dialects of Portugal can be divided into two major groups: The southern and central dialects are broadly characterized by preserving the distinction between /b/ and /v/, and by the tendency to monophthongize ei and ou to [] and [].They include the dialect of the capital, Lisbon, but it has some peculiarities of its own.Although the dialects of the Atlantic archipelagos of the Azores …