Cerro Solo, Stratovolcano on the Argentina–Chile border, Catamarca

Cerro Solo is a stratovolcano in the Andes on the Chile-Argentina border that rises to about 6.215 meters. Its slopes display the typical structure of a volcanic peak with exposed rock layers from past eruptions.

Cerro Solo was first climbed on 21 February 1950 by Luis Alvarado, Jorge Balastino, and Carlos and Oscar Alvarez, all from Chile. The Spanish Wikipedia gives 1949 as the year of the first ascent. The volcano is an extinct stratovolcano hidden between Ojos del Salado and Tres Cruces.

The territory surrounding Cerro Solo forms part of the Catamarca High Andean and Puna Lakes Ramsar Site, preserving natural mountain ecosystems.

Cerro Solo lies west of Ojos del Salado, hidden between that peak and Nevado Tres Cruces, so approach routes cross remote high-altitude terrain on both the Chilean and Argentine sides. The best climbing season runs from September to April. Plan acclimatization before attempting the 6,215-metre summit.

Cerro Solo is a relatively unknown massif hidden between the Ojos del Salado and Tres Cruces peaks. It consists of nine eruptive centers and is covered in light-colored rhyodacite pyroclastic flow deposits.