ACONCAGUA, an extinct volcano in the southern Andes with a height of about 23,000f t., usually regarded as the loftiest mountain in America. It is situated on the boundary line between Chile and Argentina in 39' S. and 70° 1' W. On its southern slope is the source of the Aconcagua river which flows westerly to the Pacific ocean through a course of about 200 miles. The summit of Aconcagua was first scaled in 1897 by Vines and Zurbriggen of the FitzGerald expedition.
Ambrose FitzGerald, "Exploration on and around Aconcagua," Geographic Journal, vol. xii., pp. 469-494 (1898) and "The First Ascent of Aconcagua," McClure's Magazine, vol. xi. (1898) ; Sir William Martin Conway, Aconcagua and Tierra del Fuego (1902).