The Mount Aconcagua is the highest mountain in the Americas, located in the Andes mountain range in Argentina. It stands at 6,962 meters (22,841 feet) above sea level, making it the highest peak in the Western and Southern Hemispheres.
From Wikipedia
Aconcagua is a mountain in the Principal Cordillera of the Andes range, located in Mendoza Province, Argentina. With a summit elevation of 6,967.15 metres, it is the highest mountain in the Americas, the highest outside Asia, and the highest peak in both the Western and Southern Hemispheres. It is the second-most topographically prominent peak in the world and one of the Seven Summits, the highest mountains on each of the seven continents.