It is Argentina.
Peru is bordered to the north by Ecuador and Columbia. It is bordered to the east by Brazil and Bolivia, and to the south by Chile.
Bolivia is South of the Equator and West of the Greenwich meridian
Both Brazil and Chile border Argentina, Bolivia and Peru.
Yes, Chile is on Argentina's western border.
Peru is bordered by Ecuador, Colombia, Brazil, Bolivia, and Chile.
Argentina and Bolivia
The natural boundaries of Chile are Argentina to the east ,Bolivia and Peru to the north, Pacific Ocean to the west and south and Atlantic Ocean to the south.
Chile borders with Peru to the north, Bolivia to the northeast, Argentina to the east, and the Drake Passage in the far south.
It borders Peru to the north, Bolivia to the northeast and Argentina to the east.
From west to east, Bolvia is southern border is with Chile, Argentina, and Paraguay.
Bolivia, Brazil, Chile, Paraguay and Uruguay.