Solimões River
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Solimões is the name often given to early stretches of the Amazon River from the border of Brazil and Peru to it's confluence with the Negro River.
Further upstream from the Border the name of the river seems to depend on the speaker. Brazilians may either continue to call it the Solimões or refer to it as the Rio Marañón -- a name which Peruvians usually only apply further upstream, before the Marañón and the Ucayali join to create what they call the Amazon.