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It lies between the commune of San Gregorio, in Magallanes Province, to the north, and the commune of Primavera, in Tierra del Fuego Province, to the south. It is the narrowest part of the Strait between the continent and the island of Tierra del Fuego.
The sound was named Primera Angostura (Spanish for First Narrows) as it was the first narrows of the strait that ships met when sailing through the strait from east to west.
The ferry company Transbordadora Austral Broom S.A. operates across the narrows.
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