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| Planalto Brasileiro | |
|---|---|
| Name | Planalto Brasileiro |
| Country | Brazil |
| Region | South America |
| Highest point | Pico da Neblina |
| Elevation m | 2995 |
Planalto Brasileiro is a major highland region occupying much of central and eastern Brazil, forming a broad elevated surface between the Amazônia lowlands and the Atlantic Ocean. It underpins territorial divisions including Minas Gerais, São Paulo, Goiás, Mato Grosso do Sul, Bahia, and Paraná, shaping river basins, settlement patterns, and transport corridors such as the BR-163 and BR-020. The region influences climatic regimes associated with El Niño–Southern Oscillation teleconnections and has been central to resource extraction histories tied to the gold rushes, coffee cycle, and soja expansion.
The plateau covers parts of the Amazon Basin, the Tocantins River drainage system, the São Francisco River watershed, the Paraná River basin and borders the Mata Atlântica to the east and the Cerrado to the west, meeting the lowlands of Nordeste and the littoral of Rio de Janeiro and Espírito Santo. Geopolitically it intersects federal units such as Distrito Federal—site of Brasília—and connects to transport hubs like Port of Santos and Belém via riverine and road networks. The highland margin is marked by escarpments adjacent to the Chapada Diamantina, the Serra do Mar, and the Serra do Espinhaço, and it is contiguous with ancient shields including the Guiana Shield and the Brazilian Shield provinces.
Relief includes the Planalto das Guianas, the Planalto Central, and the Planalto Meridional, with geomorphic features such as cuestas, mesas, chapadas, and pediplains formed on crystalline basement rocks like the Camada Pré-Cambriana and Proterozoic complexes including the Quadrilátero Ferrífero. Tectonic history relates to orogenic events like the Brasiliano orogeny and the Transbrasiliano Lineament, producing granitoids, gneisses, and banded iron formations exploited in regions like Minas Gerais and Carajás. Karst topography appears in limestone outcrops of Chapada Diamantina and Cerrado karst areas, while volcanic remnants influence soils in the Serra Geral and Paleorrota paleontological sites.
Climatic regimes span tropical wet, tropical savanna, and subtropical highland influenced by systems such as the South Atlantic Convergence Zone, trade winds from the South Atlantic Ocean, and cold fronts tracing from the South Pacific Ocean via the Falkland Current. Major rivers originating on the plateau include the Amazon River tributaries in headwater zones, the Tocantins River, the Araguaia River, the São Francisco River, and tributaries of the Paraná River including the Tietê River and the Paranapanema River, feeding reservoirs like Itaipu Dam and Sobradinho Dam. Hydrological connectivity supports navigation on waterways such as the Port of Itaqui corridor and underpins hydroelectric projects tied to companies like Eletrobras and Vale S.A..
Vegetation mosaics include the Cerrado, patches of Mata Atlântica, gallery forests along riparian corridors, and remnants of Caatinga in transitional zones; notable protected areas include Parque Nacional da Serra da Canastra, Chapada dos Veadeiros National Park, and Serra do Cipó National Park. Land use features large-scale agriculture—soybean plantations tied to Agropecuária chains, cattle ranching across Mato Grosso do Sul, sugarcane in São Paulo and Pernambuco, coffee in Minas Gerais and Espírito Santo, and mining operations in Carajás and the Iron Quadrangle (Quadrilátero Ferrífero). Urban agglomerations such as São Paulo, Belo Horizonte, Brasília, Salvador, and Porto Alegre drive peri-urban expansion, while transport projects like the Ferrovia Norte-Sul corridor influence land conversion.
Geological evolution involves ancient cratons like the São Francisco Craton, the Amazonian Craton, and Proterozoic mobile belts formed during supercontinent cycles including Rodinia and Gondwana assembly and breakup. Sedimentary basins such as the Paraná Basin record Paleozoic–Mesozoic sequences with basalts from the Central Atlantic Magmatic Province and fossiliferous strata associated with the Paleorrota Geopark. Metamorphism and uplift during events linked to the Brasiliano orogeny produced the relief subsequently sculpted by fluvial incision, eolian deposition, and lateritic weathering forming oxisols and ultisols exploited for agriculture and mining by actors like Anglo American plc and BHP.
Human occupation includes pre-Columbian indigenous groups such as the Tupiniquim, Guarani, Xavante, and Kayapó, later frontier dynamics involving bandeirantes from São Paulo and colonization waves tied to the Gold Rush in Minas Gerais, the Coffee Boom, and twentieth-century internal migration to Brasília and frontier states like Mato Grosso. Economic sectors comprise mining (iron ore, bauxite, gold), agribusiness (soy, cattle, sugarcane), manufacturing clusters in Campinas, Cubatão, and Santos, and services concentrated in São Paulo and Belo Horizonte, with multinationals such as Petrobras, Vale S.A., and JBS S.A. present. Sociopolitical processes include land tenure conflicts involving Movimento dos Trabalhadores Rurais Sem Terra and indigenous rights claims adjudicated in bodies like the Supremo Tribunal Federal.
Conservation challenges involve deforestation, cerrado conversion, fragmentation of Atlantic Forest remnants, and biodiversity loss affecting species protected under lists managed by institutions like Instituto Chico Mendes de Conservação da Biodiversidade and international frameworks like the Convention on Biological Diversity. Environmental impacts arise from dam building (e.g., Itaipu Dam, Belo Monte), mining tailings failures such as the Mariana dam disaster and the Brumadinho dam disaster, pesticide use in agribusiness affecting waterways, and urban air pollution in metropolitan areas including São Paulo and Belo Horizonte. Conservation responses include creation of conservation units, payment for ecosystem services schemes involving agencies like Banco Nacional de Desenvolvimento Econômico e Social and NGOs such as WWF-Brasil and The Nature Conservancy working with municipal initiatives in Goiânia, Vitória, and Salvador.