Porvenir is the capital of both the homonymous commune and the Chilean Province of Tierra del Fuego of the Magallanes y la Antártica Chilena Region. It is one of Chile's southernmost towns, and has 4,734 inhabitants, including several thousand soldiers. It is the largest settlement in the Chilean half of the island of Tierra del Fuego.

Tierra del Fuego Province is one of four provinces in the southern Chilean region of Magallanes and Antártica Chilena (XII). It includes the Chilean or western part of the main island of Tierra del Fuego, except for the part south of the Cordillera Darwin, which is in Antártica Chilena Province.