Puna de Atacama

The Puna de Atacama or Atacama Plateau is an arid high plateau, in the Andes of northern Chile (15%) and Argentina (85%). Geomorphologist Walther Penck based his "Grossfalt" landform association on Puna de Atacama.
Geography.
The plateau's elevation averages above sea level, and it spans an area of .
In Argentina, Puna's territory is extended in the provinces of Salta, Jujuy, and western Catamarca. In Chile, it is included in the regions of Antofagasta and north-eastern Atacama.
International borders.
Before the War of the Pacific (1879–1883), the region belonged to Bolivia. In 1898, it was ceded to Argentina in exchange for recognition of Tarija as part of Bolivia. Chile, which had annexed the Litoral Province from Bolivia, declared the exchange illegal. The border was defined in 1899 after the Puna de Atacama dispute. Of the 75,000 km2 in dispute, 64,000 (85%) were awarded to Argentina and 11,000 (15%) to Chile.