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Starting from that date the Portuguese called Rio de Solis, Rio de Plata

Since 1860, the republic name Argentina (of Latin - argentum " - that means " silver ") is the official denomination of the country.

The fluvial system of the Prata basin, one of the largest of the world, with a surface of 3.1000.000 Km2, that extends for the territories of Argentina, Bolivia, Brazil, Paraguay and Uruguay, formed by three great hydrographical units that are: Rios Paraná, Paraguay and Uruguay, all with their sources in Brazilian territory.

Rio Paraná originates from Rios Paranaíba's confluence and Rio Grande in the south of Minas Gerais, and it is the most important hydrographical system of Rio Prata, due to the magnitude
of its flow that is 12.480m3 a second, in the city of Posadas, Argentina.
The length of its course is 3.740km. The superficies of its basin is 1.510.000 Km2, unassuming Rio Paraguay's sub-basin.

The whole upper River Paraná is in Brazil, making the frontier between Brazil and Paraguay until its confluence with Rio Iguaçu finally meeting with Rio Paraguay.

When it joins Rio Paraguay its slope is very light, 0,36m/Km until the mouth. Its width decreases from 4.200m in front of Corrientes and to 2.000m in Rosário. The mouth is in a delta form, with numerous arms, begins at 320Km in its outlet. The width varies from 18 to 61Km, covering an area of 14.100Km2.

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