<Table> <Tr> <Td> </Td> <Td> This article needs additional citations for verification . Please help improve this article by adding citations to reliable sources . Unsourced material may be challenged and removed . (October 2008) (Learn how and when to remove this template message) </Td> </Tr> </Table> <Tr> <Td> </Td> <Td> This article needs additional citations for verification . Please help improve this article by adding citations to reliable sources . Unsourced material may be challenged and removed . (October 2008) (Learn how and when to remove this template message) </Td> </Tr> <P> The Altiplano (Spanish for "high plain"), Collao (Quechua and Aymara: Qullaw, meaning "place of the Qulla"), Andean Plateau or Bolivian Plateau, in west - central South America, is the area where the Andes are the widest . It is the most extensive area of high plateau on Earth outside Tibet . The bulk of the Altiplano lies in Bolivia, but its northern parts lie in Peru, and its southern parts lie in Chile and Argentina . </P> <P> The plateau hosts several cities of these three nations, including El Alto, La Paz, Oruro, and Puno . The northeastern Altiplano is more humid than the southwestern area . The latter area has several salares, or salt flats, due to its aridity . At the Bolivia--Peru border lies Lake Titicaca, the largest lake in South America . South of that in Bolivia was Lake Poopó, which was declared dried up and defunct as of December 2015 . It is unclear if this second - largest lake in Bolivia can be revitalized . </P>

What pair of countries is located on the altiplano of south america