The Altiplano (Spanish for “high plain”), Andean Plateau or Bolivian Plateau, in west-central South America, where the Andes are at their widest, is the most extensive area of high plateau on Earth outside Tibet. The bulk of the Altiplano lies within Bolivia and Peru while its southern parts lie in Chile and Argentina. The Altiplano plateau hosts several cities like El Alto, La Paz, Puno, Oruro, Potosí, and Cuzco. The northeastern Altiplano is more humid than the southwestern, the latter of which hosts several salares, or salt flats, due to its aridity. At the Bolivia-Peru border lies Lake Titicaca, the largest lake in South America. (From Wikipedia).