The Amazon River is the chief river of South America. It is ___1___ river in the world, and carries a greater volume of water ___2___. It pours an average of 3,400,000,000 gallons ___3___ into the Atlantic Ocean. The name Amazon is ___4___ applied to the entire main course, from its mouth to the Maranon-Ucayali junction in Peru. In Brazil, however, the part of the river ___5___ the Rio Negro junction is called the Salimoes. Below the junction, as well as from the Peruvian border to Iquitos, the river is called Amazonas.