What forms the watershed for the Amazon River?

Esmeraldas River

Guayas River

east side of Ecuador's mountains

west side of Columbia's mountains

The correct answer is - east side of Ecuador's mountains.

The Amazon River watershed is on the eastern slopes of the Andean mountain range where the country of Ecuador is located. This is where the huge amounts of rain create huge springs that give the basis for the Amazon River and all the other rivers that come into it from that region while going down to the enormous Amazon basin.