Yes. The Gran Chaco and the Pampas are neighboring but distinct natural regions of southern South America. The Gran Chaco is a vast semiarid lowland of dry forests, thorn scrub, and savannas spanning parts of Argentina, Paraguay, Bolivia, and Brazil, and it is often described as the continent’s second-largest forested ecoregion.
The Pampas, by contrast, are mainly fertile temperate grasslands covering large areas of Argentina, Uruguay, and southern Brazil. The southern Gran Chaco blends into the Pampas at its southern edge, but the two regions differ in vegetation, climate, and typical land use.
Source: Wikipedia — Gran Chaco