Cerro Arenas, Mountain summit in Cajón del Maipo, Chile.

Cerro Arenas is a mountain in the Andes of Chile's Santiago Metropolitan Region, reaching 4,450 metres. It stands west of the San José volcano and east of Cerro El Morado, which rises on the opposite side of the Estero Morado valley, a headwater stream of the Volcán River.

Cerro Arenas lies in the Andes of Chile's Santiago Metropolitan Region, west of the San José volcano and east of Cerro El Morado, which stands across the valley of the Estero Morado, a headwater stream of the Volcán River. The Italian Wikipedia entry gives its elevation as 4,450 metres. The sources consulted record no first ascent or climbing history for the summit.

Cerro Arenas rises west of the San José volcano and east of Cerro El Morado, which stands across the valley of the Estero Morado, a headwater stream of the Volcán River. The peak lies in the Andes of Chile's Santiago Metropolitan Region, within the Cajón del Maipo.

The climbing season runs from November through March when weather conditions are most favorable. Plan to arrive with proper mountain gear and experience, as technical climbing skills are essential for a safe ascent.

Climbers can choose between a continuous four-pitch ascent or a split climb with a camp halfway up the mountain. This flexibility allows climbers to match the route to their abilities and available time.