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Tocantinsriver, 1,640 mi (2,639 km) long, formed in S central Goiás state, Brazil, by the confluence of two headstreams. It flows N to the Pará River, the southern distributary of the Amazon, SW of Belém. It is only partly navigable because of rapids. There are diamond washes near Carolina. The main tributary is the AraguaíaAraguaía
, river, c.1,600 mi (2,575 km) long, rising in the Serra des Araras, at the border of Goiás and Mato Grosso states, S central Brazil. It flows generally northward into the Tocantins River, forming most of the border between Goiás and the states of
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Tocantins(to͝okəntēns`), state (1996 pop. 1,048,514), 110,700 sq mi (286,787 sq km), N central Brazil. Palmas is the capital. Created in 1988 from the northern half of Goiás state, Tocantins is in the Brazilian Highlands and is drained by the Araguaia and Tocantins rivers. It is a developing area with a large indigenous population and abundant mineral resources.
a river in eastern Brazil. The Tocantins is 2,850 km long and drains an area of 770,000 sq km. It is formed by the confluence of the Maranháo and Almas rivers, which originate in the central part of the Brazilian Highlands. Flowing along the highlands, the Tocantins forms numerous rapids and waterfalls. It is joined by a large left tributary, the Araguaia River. The Tocantins’ estuary empties into the Para River, which constitutes the right arm of the Amazon River delta With high-water periods from October to March or April, the river’s level rises by 7 to 9 m. The mean flow rate at the mouth is 16,800 cu m per sec. The Tocantins is navigable for a distance of 350 km from its mouth.