San José Volcano is the stratovolcano

Stratovolcano

A stratovolcano, also known as a composite volcano, is a tall, conical volcano built up by many layers of hardened lava, tephra, pumice, and volcanic ash. Unlike shield volcanoes, stratovolcanoes are characterized by a steep profile and periodic, explosive eruptions...

 that gives its name to a massive volcanic group, at about 90 km (56 mi) from Santiago

Santiago

Santiago is the capital city of Chile. Santiago may also refer to:*Santiago *Santiago , a Spanish given name*Santiago!, a shortened form of the Reconquista battle cry "Santiago y cierra, España"...

 de Chile

Chile

Chile ,officially the Republic of Chile , is a country in South America occupying a long, narrow coastal strip between the Andes mountains to the east and the Pacific Ocean to the west. It borders Peru to the north, Bolivia to the northeast, Argentina to the east, and the Drake Passage in the far...

 at the end of the Cajón de Maipo on the Chile-Argentina

Argentina

Argentina , officially the Argentine Republic , is the second largest country in South America by land area, after Brazil. It is constituted as a federation of 23 provinces and an autonomous city, Buenos Aires...

 border. It lies on the south end of an approximately 10 km (6 mi) x 5 km (3 mi) complex that includes the La Engorda, Espiritu Santo

Espíritu Santo (volcano)

Volcán Espíritu Santo is an pleistocene stratovolcano at the center of the San José volcanic group, located at from Santiago de Chile at the end of the Cajón del Maipo on the Chile-Argentina border...

, Plantat and Marmolejo

Marmolejo

Volcán Marmolejo is a high Pleistocene stratovolcano in the Andes on the border between Argentina and Chile. It is located NNE of the active San José volcano, and has the distinction of being the southernmost -plus peak in the world.- See also :...

volcanoes, the latter of which is located on the North-end of the group.