Located north of the Salar de Pedernales, Doña Ines is a 5,075 metres (16,650 ft) high cone with a diameter of 15 kilometres (9.3 mi).

[2] The basement beneath the volcano on its northern side is formed by Triassic sedimentary and volcanic rocks.

[4] Doña Ines is part of the Maricunga Belt, a volcanic arc at the western edge of the Puna plateau.

Doña Ines together with Cerros Bravos, La Coipa and the Maricunga volcanoes lies in the northern part of the belt, 50–60 kilometres (31–37 mi) west of the Central Volcanic Zone.

[3] The rocks of the summit lava domes contain hornblende, plagioclase and smaller amounts of orthopyroxene.