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Cerro Aconcagua is the highest mountain in the Americas, and the highest mountain outside Asia. It is located in the Andes mountain range, in the Argentine province of Mendoza. The summit is located about 5 kilometres from San Juan Province and 15 kilometres from the international border with Chile. It lies 112 km (70 mi) west by north of the city of Mendoza. Aconcagua is the highest peak in both the Western and Southern Hemispheres. It is one of the Seven Summits.

Aconcagua is bounded by the Valle de las Vacas to the north and east and the Valle de los Horcones Inferior to the West and South. The mountain and its surroundings are part of the Aconcagua Provincial Park. The mountain has a number of glaciers. The most substantial are the north-eastern or Polish Glacier and the eastern or English Glacier.

The mountain was created by the subduction of the Nazca Plate beneath the South American plate during the geologically recent Andean orogeny; however, it is not a volcano. The origin of the name is contested, it is either from the Arauca Aconca-Hue, which refers to the Aconcagua River and means 'comes from the other side' or the Quechua Ackon Cahuak, meaning 'Sentinel of Stone'.