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Pará
Pará river, c.200 mi (320 km) long, N Brazil. It is actually the southeastern arm or estuary of the Amazon, divided from the rest of the river by Marajó island. It receives the waters of the Tocantins River. The port of Belém is on the right bank.
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Xingu
Xingu , river, 1,230 mi (1,979 km) long, rising in central Mato Grosso state, Brazil, and winding north across Pará state into the Amazon River at the head of the Amazon delta. The Xingu, with many rapids and falls, passes through wild, partly unexplored country, and only in its lower course ...
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river
river stream of water larger than a brook or creek. Land surfaces are never perfectly flat, and as a result the runoff after precipitation tends to flow downward by the shortest and steepest course in depressions formed by the intersection of slopes. Runoffs of sufficient volume and velocity join t...
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Missouri
Missouri river, c.2,565 mi (4,130 km) long (including its Jefferson-Beaverhead-Red Rock headstream), the longest river of the United States and the principal tributary of the Mississippi River. The length of the combined Missouri-Mississippi system from the headwaters of the Missouri to the mouth...
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Amazon
Amazon Port. Amazonas , world's second longest river, c.3,900 mi (6,280 km) long, formed by the junction in N Peru's Andes Mts. of two major headstreams, the Ucayali and the shorter Marañón . It flows across N Brazil before entering the Atlantic Ocean near Belém.
The A...
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Congo
Congo or Zaïre , great river of equatorial Africa, c.2,720 mi (4,380 km) long, formed by the waters of the Lualaba River and its tributary, the Luvua River, and flowing generally N and W through Congo (Kinshasa) to the Atlantic Ocean.
Course
The second longest river of Africa and ...
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bore
bore inrush of water that advances upstream with a wavelike front, caused by the progress of incoming tide from a wide-mouthed bay into its narrower portion. The tidal movement tends to be retarded by friction as it reaches the shallower water and meets the river current; it therefore piles up and ...
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Mississippi
Mississippi river, principal river of the United States, c.2,350 mi (3,780 km) long, exceeded in length only by the Missouri River, the chief of its numerous tributaries. The combined Missouri-Mississippi system (from the Missouri's headwaters in the Rocky Mts. to the mouth of the Mississippi River...
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Japurá
Japurá , river, c.1,750 mi (2,815 km) long, rising as the Caquetá in the Andes, SW Colombia. It flows SE into Brazil, where it is called the Japurá, and enters the Amazon through a network of channels. It is navigable by small boats in Brazil.
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Orinoco
Orinoco , river of Venezuela, estimated to be from 1,500 to 1,700 mi (2,410-2,735 km) long. Rising near Mt. Delgado Chalbaud in the Guiana Highlands, S Venezuela, the Orinoco flows in a wide arc through tropical rain forests and savannas (llanos), forming part of the Venezuela-Colombia border, and e...
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