The Southern Cone (Cono Sur, Cone Sul) is a geographical and cultural subregion composed of the southernmost areas of South America, mostly south of the Tropic of Capricorn. Traditionally, it covers Argentina, Chile, and Uruguay, bounded on the west by the Pacific Ocean and on the east by the Atlantic Ocean. In terms of social, economic and political geography, the Southern Cone comprises Argentina, Chile, and Uruguay, and sometimes includes Brazil's four southernmost states (Paraná, Rio Grande do Sul, Santa Catarina, and São Paulo). In its broadest definition, taking into account common history and geography, it also includes Paraguay, another Spanish-speaking country.
High life expectancy, the highest Human Development Index of Latin America, high standard of living, low fertility rates, significant participation in global markets and the emerging economy of its members make the Southern Cone the most prosperous subregion in Latin America.
The climates are mostly temperate, but include humid subtropical, Mediterranean, highland tropical, maritime temperate, sub-Antarctic temperate, highland cold, desert and semi-arid temperate regions. Except for the northern regions of Argentina (thermal equator in January), the whole country of Paraguay, the Argentina-Brazil border and the interior of the Atacama Desert, the region rarely suffers from heat. In addition to that, the winter presents mostly cool temperatures. Strong and constant wind and high humidity are what brings low temperatures in the winter. The Atacama is the driest place on Earth.
One of the most peculiar plants of the region is the Araucaria tree, which can be found in Brazil, Chile and Argentina. The only native group of conifers found in the southern hemisphere had its origin in the Southern Cone. Araucaria angustifolia, once widespread in Southern Brazil, is now a critically endangered species, protected by law. The prairies region of central Argentina, Uruguay and southern Brazil is known as the Pampas.