What two plates make up convergent boundary near south America?

The convergent boundary near South America is primarily formed by the Nazca Plate and the South American Plate. The Nazca Plate is an oceanic plate that is subducting beneath the continental South American Plate, leading to significant geological activity, including the uplift of the Andes Mountains and frequent earthquakes in the region. This interaction is a classic example of an oceanic-continental convergent boundary.