ocr: Argentina (ahr juhn TEE nuh) - Capital Buenos Aires Currency Peso Language Spanish Physical Feature Mt. Aconcagua, which rises to 22,831 ft. (6,850 m),is the highest summit in the Western Hemisphere. Landmark Horseshoe-shaped Iguassu Falls is four times the width of Niagara Falls. Did you know? The name Argentirn comes from a Latin term meaning "silver. a Early Spanish explorers searched for silver here, but found very little.