The Amazon is truly an extreme place. Both the largest river and the largest rain forest on Earth are in the Amazon.The Amazon River starts in the Andes Mountains in Peru and flows adout 6,000 kilometers to the Atlantic Ocean.It is the second longest river in the world.It is also the largest river in the world.During the wet season,parts of the river grow to 190 km wide! twenty percant of the fresh water in all the world's oceans comes from the Amazon River Now that's extreme!