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16-483: 3°00′S 58°00′W  /  3.000°S 58.000°W  / -3.000; -58.000 Ilha Tupinambarana is a former fluvial island bordered by rivers of the Amazon system (Amazon, Madeira , Sucunduri , and Abacaxis ) in eastern Amazonas , Brazil . It has been split into four completely separate parts by natural channels , just like those isolating it from the mainland . The original island stretched from

32-477: A location in the Brazilian state of Amazonas is a stub . You can help Misplaced Pages by expanding it . This article about an island is a stub . You can help Misplaced Pages by expanding it . River island These islands result from changes in the course of a river. Such changes may be caused by interactions with a tributary , or by the opposing fluvial actions of deposition and/or erosion that form

48-543: A natural cut and meander . Nascent vegetation-free shoals and mudflats may dissipate and shift or build up into such islands through deposition; the process may be assisted through artificial reinforcement or natural factors, such as reeds , palms , evergreen trees or willows , that act as obstacles or erosion barriers, so that water flows around them. Islands may be small or large, covering many square kilometers, examples of which are given below. The term " towhead " implies an islet (small island) or shoal within

64-472: A population of at least 25,000. Araguaia River The Araguaia River ( Portuguese : Rio Araguaia [ˈʁi.u aɾaˈɡwajjɐ] , Karajá : ♂ Berohokỹ [beɾohoˈkə̃], ♀ Bèrakuhukỹ [bɛɾakuhuˈkə̃]) is one of the major rivers of Brazil , and a tributary of the Tocantins River . The Araguaia River comes from Goiás-Mato Grosso south borders. From there it flows northeast to a junction with

80-630: A river (most often the Mississippi River ) having a grouping or thicket of trees, and is often used in the Midwestern United States . Many rivers, if wide enough, can house considerably large islands. The term "towhead" was popularised by Mark Twain 's Adventures of Huckleberry Finn . In England, a river island in the Thames is referred to as an " ait " (or "eyot"). Majuli (a non-coastal landmass between two banks of

96-695: A river), located in the Brahmaputra River in Assam , India , is recognised by Guinness World Records as the world's largest inhabited riverine island, at 880 square kilometres (340 sq mi). The Encyclopædia Britannica cites another large non-coastal landmass, Bananal Island (an island that divides the Araguaia River into two branches over a 320 km (200-mile) length of water), located in Tocantins , central Brazil, to be

112-520: Is among contenders as the smallest permanently-inhabited river island, or islet , with fixed dwellings. Umananda also lies in the Brahmaputra River . Many as tiny as Umananda or smaller, inhabited, exist on the Amazon basin and Bangladesh . Another island of comparable size to Umananda, Hatfield Island in the Guyandotte River in the U.S. state of West Virginia , has no permanent population, but contains several permanent buildings, namely

128-601: Is navigable to Pará . Other important tributaries include the Bonito , Garcas , Tapirape and the Formoso or Cristalino on the west, and the Pitombas , Claro , Vermelho , Tucupa and Chavante on the east. It was explored in part by Henri Coudreau in 1897. From 1972 to 1974 this region was the scene of a conflict between left-wing guerrilla movements and forces supporting the then military dictatorship . Among

144-698: The Araguaia Tocantins Basin ) covers approximately 9.5% of Brazil's national territory. This area is an integral part of the Amazon biome ; however, the Araguaia River is not a tributary of the Amazon. "Araguaia" means "River of the macaws " in the native Tupi language . Its principal tributary is the Rio das Mortes , which rises in the Serra de São Jerônimo , near Cuiabá , Mato Grosso, and

160-728: The K–12 schools serving the city of Logan and its surrounding area plus the main branch of the Logan County public library. On canalised rivers , such as the Thames and the Seine , one-home islands exist, containing houses constructed of permanent materials. Canals reduce erosion of the islands and in particular limit the height of flash flooding by maintaining substantial "heads" of water through barrages . One-home islands improved by river canals include Monkey , Friday , Holm and D'Oyly Carte islands. This list ranks river islands with

176-600: The Tocantins near the town of São João. Along its course, the river forms the border between the states of Goiás , Mato Grosso , Tocantins and Pará . Roughly in the middle of its course the Araguaia splits into a fork (with the western stream retaining the name Araguaia and the eastern one being called the Javaés River ). These later reunite, forming the Ilha do Bananal , the world's largest river island. The vein of

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192-644: The black caiman , the pirarucú , one of the world's largest freshwater fish, and the Araguaian river dolphin (or Araguaian boto), all occurring within a large area. A large portion of the Araguaia's course is navigable all year, but the river below the Cantão wetlands is interrupted by rapids. The middle and lower basin of the river is in the Xingu–Tocantins–Araguaia moist forests ecoregion. The combined watershed of Araguaia and Tocantins rivers (named

208-454: The municipalities of Parintins , in the northeast, to Nova Olinda do Norte , in the southwest. The combined area of the islands is to 11,850 km, making Ilha Tupinambarana the second largest fluvial group of islands in the world after Bananal Island . The largest of the four parts is the 93rd largest island in the world and the 3rd largest island in Brazil . This article about

224-535: The Javaés forms a broad inland where it pours back into the main Araguaia, a 100,000 hectare expanse of igapós or flooded forest, blackwater river channels, and oxbow lakes called Cantão , protected by the Cantão State Park . It is one of the biologically richest areas of the eastern Amazon, with over 700 species of birds, nearly 300 species of fish, large populations of species such as the giant otter ,

240-547: The most important settlements on the banks of the Araguaia River are (in a downstream order): Several parts of the river's course are protected by national parks and other reserves like the Emas National Park and the Araguaia National Park . The Araguaia has "beaches" - bright sandy banks that seam the stream from May to October. Deforestation and expansion of cattle ranching and agriculture in

256-496: The world's largest river island instead, at 19,162 square kilometres (7,398 sq mi). However, Bananal Island is not considered a riverine island by some geologists, as they consider the Araguaia River to form two distributaries, and Bananal Island to be the landmass between these two distributed rivers. However, Bananal Island is technically an island as it does not touch the main landmass at any point. Umananda Island , at 0.02 square kilometres (0.0077 sq mi),

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