Para River is a famous river in South America and it is the seventh-largest river in the world by discharge volume. Synonyms for Para River are not as well-known. It is also called Rio Guama or Amazon River or Rio Tocantins. These names are used interchangeably to refer to the Para River in Brazil. The Amazon River is the largest river in the world by discharge volume and it stretches across South America, passing through Brazil, Peru, and Colombia. The Rio Guama is a tributary of the Para River and forms part of the drainage basin of the Amazon River. The Rio Tocantins also flows through Brazil and is also a tributary of the Para River.