The South American Plain is a vast area of flat land that stretches across the continent. It is composed of four distinct regions: the Campo, Llanos, PAMPAS, and PAMPA. The Campo is a grassland region located in the southern part of Brazil. The Llanos is a tropical grassland region located in Venezuela and Colombia. The PAMPAS is a fertile grassland region located in Argentina and Uruguay. Lastly, the PAMPA is a semi-arid grassland region located in Argentina and Uruguay. All four regions are characterized by their flat terrain and abundance of grasslands.