ARAGUAY

ARAGUAYA  Or ARAGUIA, a river of Brazil and principal affluent of the Tocantins, rising in the Serra do Cayap6, where it is known as the Rio Grande, and flowing in a north by east direction to a junction with the Tocantins at Sao Joao do Araguaya, or Sao Joao das Duas Barras . Its upper course forms the boundary line between Goyaz and Matto Grosso . The river divides into two branches at about 13° 20' S. lat., and unites again at ro° 30', forming the large island of Santa Anna or Bananal . The eastern branch, called the Furo, is the one used by boats, as the main channel is obstructed by rapids . Its principal affluent is the Rio das Mortes, which rises in the Serra de Sao Jeronymo, near Cuyaba, Matto Grosso, and is utilized by boatmen going to Para . Of other affluents, the Bonito, Garcas, Cristallino and Tapirape on the west, and the Pitombas, Claro, Vermelho, Tucupa and Chavante on the east, nothing definite is known as the country is still largely unexplored . The Araguaya has a course of ro8o m., considerable stretches of which are navigable for small river steamers, but as the river below Santa Anna Island is interrupted by reefs and rapids in two places—one having a fall of 85 ft. in 18 m., and the other a fall of 50 ft. in 12 m.—it affords no practicable outlet for the products of the state . It was explored in part by Henri Coudreau in 1897 . See Coudreau's Voyage au Tocantins-Araguaya (Paris, 1897) .