[2] This province, with a surface area of 60,000 square kilometres (23,000 sq mi), includes Payún Matrú and Llancanelo volcanic field.
[4] Activity is controlled by tectonic extension 70 kilometres (43 mi) west of the Andes and has sent lava flows which reach the Rio Salado.
[1] The Infiernillo is part of a transitory region of the Southern Volcanic Zone between the northern and central segment thereof.
Lagunitas volcano conversely is a 150 metres (490 ft) high stratovolcano-like cone that generated a blocky lava flow 2.2 kilometres (1.4 mi) long.
Hoyo Colorado is a cone which generated a complex lava field damming the Salado river.