ANSWER ASAP 70 POINTS How is the location on the Amazon River related to the location of Brazil's population?

This is the longest river in Brazil and the second longest in the world, located in the northern part of the country. It flows from its source in southern Peru north and then east, entering Brazil in its northwestern part and traversing the country to the Atlantic Ocean. This river has the largest discharge and drainage basin of any river on Earth, and there is a large island at its mouth called Marajo. this should help somewhat

Where are the following