The Altiplano is a high plateau located in the central Andes region of South America at an altitude of about 13,123 ft (4,000 m). It reaches into parts of Peru, Bolivia, Chile, and Argentina. On the west, it bounds the Cordillera Occidental and borders the Cordillera Oriental on the east. It is surrounded by volcanoes reaching altitudes of 19,685 ft (6,000 m), whose activities have caused landfalls that are responsible for the reshaping of this large plateau. The Altiplano has an area of 105,633 square mi (170,000 square km) that is volcanic in origin.