The Patagonian Desert, also known as the Patagonian Steppe, is a semiarid scrub plateau. The Patagonian steppe ecoregion, also known as the Magellanic Steppe, mainly covers the Patagonia region of Argentina to barely across the border into Chile.
The Sonoran Desert, also called Desierto de Altar, is an arid region covering 120,000 sq mi. This North American desert ecoregion covers large parts of northwestern Mexico in Sonora, Baja California and Baja California Sur as well as parts of the southwestern U.S.
The Altiplano, also called Puna, is a region in west-central South America in the area where the Andes are the widest. It is the most extensive area of high plateau on earth outside Tibet. The bulk of the Altiplano lies in Bolivia but its northern parts lie in Peru and its southern parts lie in Chile and Argentina.
The Cerrado is the largest savanna region in South America and the largest ecoregion in the Americas. It encompasses central Brazil as well as small portions of northeastern Paraguay and eastern Bolivia. Biologically the richest savanna in all the world, it contains an extraordinary amount of biodiversity.
The Pampas are a natural region of vast fertile lowland plains in South America that extend from the Atlantic Ocean to the Andes Mountains. These flat, fertile plains are a grassland biome that can be divided into three distinct ecoregions: the Uruguayan Savanna, the Humid Pampas and the Semiarid Pampas.
Stretching across Brazil, Bolivia and Paraguay, the Pantanal is a natural region encompassing the world's largest tropical wetland area. Although not as well known as the Amazon Rainforest to its north, this gigantic seasonal floodplain is also home to a staggering variety of plants and wildlife.
The Yungas is a narrow band of forest along the eastern slope of the Andes Mountains within Peru, Bolivia and northern Argentina. This humid, subtropical natural region is a transitional zone between the Andean highlands and the eastern forests.