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Marajó(mərəzhô`), island, c.150 mi (240 km) long and c.100 mi (160 km) wide, N Brazil, at the mouth of the Amazon River. It divides the river into the Amazon proper and the Pará. Cattle are raised on the extensive eastern grasslands, and water buffaloes are bred in the low, swampy west. The island is famous for its prehistoric mounds, which yield handsome pottery.
a low-lying island in Brazil at the mouth of the Amazon River between one of the Amazon’s northern branches, the Pará River in the south, and the MarajÓ Bay in the southeast. Area, approximately 48,000 sq km. The western part is covered with dense evergreen forest containing valuable timber; in the east there is palm savanna with flooded meadows and swamps. There is timber industry in the west and livestock raising for meat in the east.