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San Blas is one of the 20 municipalities of the Mexican state of Nayarit . Its municipal seat is San Blas , a historic port of Mexico .
The municipality of San Blas is located on the northern coast of the state of Nayarit, it has a territorial extension of 823.60 square kilometers that represent 3.0% of the total surface of the state and the Marías Islands , located off its coast, are an integral part of it.