Which is the third and fourth largest countries in south America?

* Area: 2,780,400 km² (1,073,500 sq mi)

* Population: 45,195,774 (2020)

* Capital: Buenos Aires

The fourth-largest country in South America is Peru.

* Area: 1,285,216 km² (496,225 sq mi)

* Population: 32,971,854 (2020)

* Capital: Lima