What is west of Argentina?

* The Andes Mountains: This massive mountain range forms the western border of Argentina and extends all the way down the western edge of South America.

* The Pacific Ocean: The Pacific Ocean lies west of the Andes Mountains and Argentina's western coast.

* Chile: The country of Chile borders Argentina to the west, nestled between the Andes and the Pacific.

So, depending on what you mean by "west", you could be referring to any of these geographic features!