Salar de Uyuni is part of the Altiplano of Bolivia in South America. Volcanism in the Central Volcanic Zone mostly occurs on the Altiplano and the Cordillera Occidental. Various narrow, isolated ridges cross the plateaus of the northern altiplano. The southern altiplano contains numerous valleys originally formed by ancient lakes. Parinacota lies on the western margin of the Altiplano in the Central Andes. Many Aymara live and work as campesinos in the surrounding Altiplano. Together with this uplift several valleys incised in the western flank of the Altiplano. Altiplano and a number of major valleys such as the Rio Magdalena. Aymara' for the Altiplano branch. The northeastern Altiplano is more humid than the southwestern area. It is found in the Altiplano and Patagonia in South America. It is located in a bowl-like depression surrounded by the high mountains of the Altiplano. In 2014, Piaget presented the Altiplano 900P. The people of the Caral culture traded for sodalite from the Collao altiplano. Afterwards the Britons brought in Italians for construction of the railroad of Altiplano.