Los Patos, Volcanic summit on the Argentina–Chile border, Catamarca Province

Cerro de Tres Quebradas, also called Los Patos, is a stratovolcano on the Argentina–Chile border between Catamarca Province and the Atacama Region, near the San Francisco border pass. It rises to 6,239 metres and is built mainly of dacite with some andesite, part of the Cordillera Sundt. The base of Nevado Tres Cruces lies immediately east of the volcano.

In 1936, two low stone walls (pircas) of Inca origin were found on one of its slopes, with remains of materials presumably used in a ritual. The first sporting ascent was made in 1937 by a Polish delegation of S. Osiecki, J. Wojsznis, W. Paryski and J. Szczepanski. The volcano lies on the Chile–Argentina border near the San Francisco border pass, between the Atacama Region and Catamarca Province.

The name Los Patos, also used as Tres Quebradas, refers to the mountain on the Catamarca–Atacama border. In 1936, Inca archaeological remains were found on one of its slopes: two low stone walls, or pircas, enclosing material remains, presumably used in a ritual. The summit also holds a prehistoric sanctuary.

The climbing season runs from September to April, though altiplano winter storms can bring sudden weather changes at any time. The peak lies near the San Francisco border pass between the Atacama Region and Catamarca Province, so approach routes come from both sides of the international border.

The summit holds a prehistoric sanctuary, and in 1936 two low stone walls, pircas, were found on one flank with remains of materials presumed used in ritual. The first sporting ascent came in 1937 with a Polish delegation of S. Osiecki, J. Wojsznis, W. Paryski and J. Szczepanski.