Brazil covers nearly half of South America and is the continent's largest nation. It extends 2,965 mi (4,772 km) north-south, 2,691 mi (4,331 km) east-west, and borders every nation on the continent except Chile and Ecuador. Brazil may be divided into the Brazilian Highlands, or plateau, in the south and the Amazon River Basin in the north. Over a third of Brazil is drained by the Amazon and its more than 200 tributaries. The Amazon is navigable for ocean steamers to Iquitos, Peru, 2,300 mi (3,700 km) upstream. Southern Brazil is drained by the Plata system—the Paraguay, Uruguay, and Paraná rivers.
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