Geography of South America

Geography of South America
Blue Marble by Reto Stockli, NASA/GSFC; orthographic projection by Dave Pape · Public domain · source
Name	South America
Caption	Relief map of South America
Area km2	17840000
Highest point	Aconcagua
Highest elevation m	6960
Population	430000000
Population year	2025 (estimate)
Countries	Argentina, Bolivia, Brazil, Chile, Colombia, Ecuador, Guyana, Paraguay, Peru, Suriname, Uruguay, Venezuela, French Guiana
Major cities	São Paulo, Buenos Aires, Rio de Janeiro, Lima, Bogotá, Santiago

Geography of South America describes the continent's spatial arrangement of landforms, climates, hydrological networks, and human settlement patterns across states such as Argentina, Brazil, Peru, and Colombia. The continent spans from the Isthmus of Panama in the northwest to the Drake Passage in the south, encompassing major features like the Andes, the Amazon Basin, and the Patagonian Plateau. Its position between the Caribbean Sea, the South Atlantic Ocean, and the South Pacific Ocean shapes oceanic and atmospheric circulation that influence environments from the Atacama Desert to the Amazon Rainforest.

Physical geography

The continent's principal orogen is the Andes, running through Venezuela, Colombia, Ecuador, Peru, Bolivia, Chile, and Argentina, and hosting peaks such as Aconcagua and volcanic chains linked to the Ring of Fire. East of the Andes lies the vast lowland Amazon Basin within Brazil, Peru, and Colombia, fed by tributaries including the Madeira River and the Negro River, and bordered by the Guiana Shield underlain by ancient Precambrian craton. Southern regions include the Patagonian Desert and the Pampas across Argentina and Uruguay, while the Gran Chaco extends into Paraguay, Argentina, and Bolivia. Offshore islands and archipelagos such as the Galápagos Islands (associated with Ecuador), the Falkland Islands (claimed by Argentina), and the subantarctic South Georgia and the South Sandwich Islands contribute to the continent’s maritime geography.

Climate and biomes

Climatic regimes range from equatorial monsoon and tropical rainforest climates of the Amazon Rainforest and Orinoco Basin across Brazil and Venezuela, to arid climates of the Atacama Desert in Chile and the semi-arid Caatinga in northeastern Brazil. Highland climates in the Andes produce puna and páramo ecosystems in Peru and Ecuador, while temperate grasslands such as the Pampas support agriculture around Buenos Aires and Montevideo. Southern latitudes include cold temperate and subpolar climates in Patagonia and on Tierra del Fuego, influenced by the Falklands Current and westerly winds associated with the Antarctic Circumpolar Current.

Hydrology and major rivers

The continent's principal drainage is the Amazon River, which discharges into the Atlantic Ocean and is fed by major tributaries like the Madeira River, Negro River, Xingu River, and Tapajós River across Brazil, Peru, and Bolivia. Northern systems include the Orinoco River basin in Venezuela and the Guiana Shield catchments in Guyana and Suriname. Southern watersheds comprise the Paraná River and Paraguay River feeding the Rio de la Plata estuary between Argentina and Uruguay, and the Magdalena River servicing Colombia. Glacial-fed rivers and proglacial lakes in the Andes provide headwaters for many basins, while coastal estuaries and mangrove systems occur along the Atlantic Coast and Pacific Coast affecting ports like Callao and Salvador.

Geology and tectonics

South America rests on the South American Plate with active subduction of the Nazca Plate beneath the western margin producing the Andes and frequent seismicity that affects cities such as Quito and Santiago. The ancient Amazonian Craton and Guiana Shield preserve Proterozoic and Archean basement exposed in regions like the Serra do Mar and Roraima. Magmatism and volcanism associated with the subduction zone generate stratovolcanoes in Chile and Ecuador including Cotopaxi and Llaima, while intracontinental basins such as the Paraná Basin record extensive flood basalts like the Paraná-Etendeka province. Tectonic uplift, crustal shortening, and Andean orogenic pulses have controlled sedimentation patterns in foreland basins like the Neuquén Basin and influenced hydrocarbon provinces offshore and onshore in Maracaibo Basin and Campos Basin.

Human geography and population distribution

Population concentrations cluster along coastal megacities—São Paulo, Buenos Aires, Rio de Janeiro, Lima, and Bogotá—while interior regions such as the Amazonas and the Gran Chaco exhibit low population density and significant indigenous presence including Quechua and Guarani communities. Colonial-era port networks established by Spanish Empire and Portuguese Empire shaped urban hierarchies; modern economic corridors follow transport axes like the Pan-American Highway and riverine routes along the Amazon River and Paraná River. Land use mosaics include intensive agriculture in the Pampas and Cerrado as well as mining frontiers in the Andes and extractive zones in the Amazon Rainforest, affecting demographic shifts, rural–urban migration trends, and metropolitan expansion around capitals such as Caracas and Quito.

Environmental issues and conservation

Key environmental concerns include deforestation in the Amazon Rainforest driven by cattle ranching, soy cultivation, and infrastructure linked to projects like the Trans-Amazonian Highway, biodiversity loss across hotspots such as the Atlantic Forest, and pollution in estuaries like the Rio de la Plata. Climate change impacts—glacial retreat in the Andes, altered precipitation in the Pantanal wetland, and sea level rise affecting Buenos Aires and Manaus—interact with governance frameworks in nations including Brazil, Peru, and Chile that implement protected areas such as Yasuní National Park and transboundary initiatives like the Amazon Cooperation Treaty Organization. Conservation efforts involve national parks, biosphere reserves, and indigenous territories like those of the Yanomami and Asháninka, while multinational science collaborations and NGOs such as Conservation International and World Wildlife Fund engage in research, restoration, and policy advocacy.

Category:South America