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The Uruguay River ((スペイン語:Río Uruguay), (:uɾuˈɣwai); (ポルトガル語:Rio Uruguai), (:uɾuˈɡwaj)) is a river in South America. It flows from north to south and forms parts of the boundaries of Brazil, Argentina, and Uruguay, separating some of the Argentine provinces of La Mesopotamia from the other two countries. It passes between the states of Santa Catarina and Rio Grande do Sul in Brazil; forms the eastern border of the provinces of Misiones, Corrientes, and Entre Ríos in Argentina; and makes up the western borders of the departments of Artigas, Salto, Paysandú, Río Negro, Soriano, and Colonia in Uruguay. The river measures about in length and starts in the Serra do Mar in Brazil,〔(Rio Uruguay )〕〔(Consejo Nacional de Investigaciones Científicas y Técnicas )〕〔(FACULDADE DE BIOCIÊNCIAS PROGRAMA DE PÓS-GRADUAÇÃO EM BIOCIÊNCIAS – ZOOLOGIA )〕〔〔(The fish fauna of two tributaries of the passo fundo river, uruguay river basin, rio grande do sul, brazil )〕 where the Canoas River and the Pelotas River are joined, at about above mean sea level. In this stage the river goes through uneven, broken terrain, forming rapids and falls. Its course through Rio Grande do Sul is not navigable. An unusual feature of the Uruguay River is a submerged canyon. This canyon formed during the Ice Age, when the climate was drier and the river was narrower. Its depth is up to below the bottom of the river channel and it is 1/8 to 1/3 as wide as the river.〔 The canyon is only visible in two places, one of which is the Moconá Falls (also called the Yucumã Falls). However, the falls are not visible for 150 days per year and become more like rapids when they are not visible. Unlike most waterfalls, the Moconá Falls are parallel to the river, not perpendicular. The falls are to high and between and wide. They are from the mouth of the river.〔〔(【引用サイトリンク】title=Moconá Falls (Yucumã Falls) )〕 Together with the Paraná River, the Uruguay forms the Río de la Plata estuary. It is navigable from around Salto Chico. Its main tributary is the Río Negro, which is born in the south of Brazil and goes through Uruguay for 500 km until its confluence with the Uruguay River, which is located 100 km north of the Uruguay's confluence with the Río de la Plata, in Punta Gorda, Colonia Department, Uruguay. The river is crossed by five international bridges called (from north to south): Integration Bridge and Paso de los Libres-Uruguaiana International Bridge, between Argentina and Brazil; and the Salto Grande Bridge, General Artigas Bridge and Libertador General San Martín Bridge between Argentina and Uruguay. The drainage basin of the Uruguay River has an area of . Its main economic use is the generation of hydroelectricity and it is dammed in its lower portion by the Salto Grande Dam and by the Itá Dam upstream in Brazil. ==Origin of the name== The name of the river comes from the Spanish settlers' interpretation of the Guaraní language word the inhabitants of the region used to designate it. There are several interpretations, including "the river of the uru (an indigenous bird)", and "(of ) the uruguá" (an indigenous gastropod, ''Pomella Megastoma'').〔(El País newspaper: Presentan tesis del nombre Uruguay ), Retrieved 21 November 2014.〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Uruguay River」の詳細全文を読む スポンサード リンク
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