The eastern parts of this region lie within the higher ranges of the Andes and include a large district. This arid, bleak area is apparently a continuation southward of the great Altiplano, and is known as the Puna de Atacama. Its average elevation is estimated at 11,000 to 12,000 ft. A line of volcanoes crosses it from north to south, and extensive lava beds cover a considerable part of its surface. The chief summits being those of Licancabur, Acamarachi, Láscar, Miñiques, Pular, Socompa, Llullaillaco. Large shallow saline lakes are also characteristic features of this region. The area receives considerable rainfall during the summer months in what is commonly known as the Bolivian Winter, forming shallow lakes of mostly saline waters that are home to a number of bird species, including the flamingo species Andean, Chilean and James.