northwestern parts of the plateau consist of broad, rolling terrain broken by low, rounded hills.[146]
The southeastern section is more rugged, with a complex mass of ridges and mountain ranges reaching elevations of up to 1,200 metres (3,900 ft).[146] These ranges include the Mantiqueira and Espinhaço mountains and the Serra do Mar.[146] In the north, the Guiana Highlands form a major drainage divide, separating rivers that flow south into the Amazon Basin from rivers that empty into the Orinoco River system, in Venezuela, to the north. The highest point in Brazil is the Pico da Neblina at 2,994 metres (9,823 ft), and the lowest is the Atlantic Ocean.[10]
Brazil has a dense and complex system of rivers, one of the world's most extensive, with eight major drainage basins, all of which drain into the Atlantic.[147] Major rivers include the Amazon (the world's second-longest river and the largest in terms of volume of water), the Paraná and its major tributary the Iguaçu (which includes the Iguazu Falls), the Negro, São Francisco, Xingu, Madeira and Tapajós rivers.[147]
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