Cerro Solo is a large stratovolcano on the border between Argentina and Chile, west of Ojos del Salado[5] with an elevation of 6,215 metres (20,390 ft) metres.

[6][7][a][b][c] It consists of nine eruptive centers and is covered in light-colored rhyodacite pyroclastic flow deposits.

Its territory is within the Argentinean protection area of Catamarca High Andean and Puna Lakes Ramsar Site.

[7] Solo was first climbed by Luis Alvarado, Jorge Balastino, Carlos and Oscar Alvarez (Chile) on 21 February 1950.

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