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Solimões (Portuguese pronunciation: [soliˈmõjs]) is the name often given to upper stretches of the Amazon River in Brazil from its confluence with the Rio Negro upstream to the border of Peru. At the confluence, the river is already by far the largest river in the world, even though its two largest tributaries have not yet entered (the Negro and the Madeira River). The Solimões portion of the Amazon river lies entirely in the State of Amazonas, Brazil, and some portion of the state is often referred to as the "Solimões region". The ecoregion of the Solimões river drainage basin is entirely tropical rainforest.
The name Solimões is mostly confined to Brazilian Portuguese usage; the rest of the world simply refers to this portion of the river as the Amazon River.
A nation of aborigines called Soriman corrupted into Solimao and Soliemoens imparted the name to this river and region.