Andes
The Andes or Andean Mountains () are the longest continental mountain range in the world, forming a continuous highland along the western edge of South America. This range is about long, about wide (widest between 18° south and 20° south latitude), and of an average height of about . The Andes extend from north to south through seven South American countries: Venezuela, Colombia, Ecuador, Peru, Bolivia, Chile and Argentina.
Argentine Monte
The Argentine Monte is in north-central Argentina, and has an area of .
It is to the east of the Andes and extends from Salta Province in the north to Chubut Province in the south.
It covers the eastern foothills of the Andes.
The ecoregion merges into the Patagonian steppe in the south, where it extends east to the Atlantic Ocean. 
In the north it lies between areas of Dry Chaco and Southern Andean Yungas to the east, and Central Andean puna and Southern Andean steppe to the west. 
In south it lies between Espinal to the east and Patagonian steppe to the west.