Robledo, Volcanic peak in Catamarca Province, Argentina.

Robledo is a volcanic peak in western Catamarca Province that rises above 4,400 meters. The mountain consists of multiple layers of volcanic rock that show the history of different eruption periods.

The mountain took shape during the Quaternary period through multiple volcanic eruptions that layered different materials. This geological record reveals how the Andes developed in this region over millions of years.

The name Cerro Blanco, "White Hill", comes from the pale ignimbrite and white sinter deposits left by hydrothermal activity on the caldera floor. The Smithsonian Institution catalogues the volcano as Robledo, after the older southern caldera, so both names circulate. Provincial Route 34 between Fiambalá and Antofagasta de la Sierra passes the site.

Reaching the site requires a four-wheel-drive vehicle and equipment designed for high-altitude mountain travel. Visitors should prepare physically for the elevation and difficult terrain before attempting the journey.

The ignimbrite fields around the caldera carry wind-built ripple marks up to 2.3 metres high and spaced as much as 43 metres apart, among the largest on Earth; geologists have compared them with ripple marks on Mars.