RIO BRANCO

The Rio Branco, which forms a bit upstream of the city of Boa Vista that it skirts, arpink the state of Roraima north to the south, where it flows into the Rio Negro. So it's a subtributary of the Amazon. On both sides of the Rio Branco, there is a set of mountain ranges (culminating at 3,000 m above sea level) that serve as a natural border between Venezuela and Brazil, whose relief separates the Amazon and Orennoque basins and whose forests constitute the last unexplored portion of the south continent. American.