Brazil is a Country in east-central South America. Brazil may be divided into many regions, but the Amazon lowlands and the Brazilian Highlands dominate the landscape. The highlands, a plateau with an average elevation of 3,300 ft, are primarily in the southeast, while the Amazon lowlands, with elevations below 800 ft, are in the north. The Amazon River basin, with its more than 1,000 known tributaries, occupies nearly half of the country’s total area. Brazil’s other rivers include the São Francisco, Parnaíba, Paraguay, Alto Paraná, and Uruguay. Except for the islands of Marajó and Caviana at the mouth of the Amazon and Maracá to the north.