The Puna grassland ecoregion, of the montane grasslands and shrublands biome, is found in the central Andes Mountains of South America. It is considered one of the eight Natural Regions in Peru, but extends south as far as northern Argentina and Chile. The Puna grassland ecoregion is a high elevation montane grassland in the southern high Andes, extending from southern Peru, through Bolivia, into northern Argentina. The term puna encompasses diverse ecosystems of the high Central Andes above 3400 m from northern Peru to northern Argentine.
The puna is found above the treeline at 3,200 - 3,500 m elevation, and below the permanent snow line above 4,500 - 5,000 m elevation. It extends from central Peru in the north, across the Altiplano plateau of Peru and Bolivia, and south along the spine of the Andes into northern Argentina and Chile.
Other sources claim that it goes on Suni (high plateaus and cliffs, some agriculture) and from 4,000 m. to the snow line (permafrost and alpine desert) of Puna grassland (mountain tops and slopes, much colder).
The puna is a diverse ecosystem that comprises varied ecoregions labeled wet/moist puna, dry puna and desert puna.