The Tropic of Capricorn crosses four South American countries:

1. Brazil: The Tropic of Capricorn cuts through the northern part of Brazil, passing through states like Mato Grosso do Sul, Goiás, and Minas Gerais.

2. Paraguay: The Tropic of Capricorn runs through the southern part of Paraguay, passing through the departments of Presidente Hayes, Boquerón, and Alto Paraguay.

3. Argentina: The Tropic of Capricorn passes through the northern part of Argentina, including provinces like Formosa, Chaco, and Santiago del Estero.

4. Chile: The Tropic of Capricorn crosses through the northernmost part of Chile, passing through the Atacama Desert and the region of Antofagasta.