Source: Insight Guides: Brazil, p. 278.
Comments: The Equator passes through the northern part of Amazonia, and it crosses right through the river's mouth where it empties into the Atlantic Ocean. On the north side of Amazonia, Brazil borders, in Counter-clockwise order, French Guiana, Surinam, Guyana, Venezuela, Colombia, Perú, and Bolivia. Notice that the giant Amazonian river system had its headwaters near Cuzco, Perú, in the extreme lower left of this map. Notice, too, that the Rio Amazonas proper begins immediately downriver from Manaus (in the center of this map) where the Rio Negro and the Rio Solimões join.