The Araguaia River is a significant waterway that flows through Brazil, acting as a vital resource for human and wildlife alike. Synonyms for the Araguaia River include one of the most prominent and well-known rivers in Brazil, "Rio Araguaia." There are several other synonyms for the Araguaia River, including "Araguaia Basin" and "Araguaia-Tocantins Basin," which refer to the wider area surrounding the river and its tributaries. Other synonyms include "Rio das Mortes," which is a name that has been given to a stretch of the river known for its dangerous rapids, and "Rio das Lontras," which means "Otter River" in Portuguese and is a nod to the abundant wildlife that calls the Araguaia home.