The Amazon, also known as Amazonas, is the largest river in the world in the New World. It didn't exist before the 1/10/2014 reset. It was explored the first time by the Spanish player DONREPANOCHA (aka Don), who reached the Amazon source on the 9th of October, 2014. His travel had got into 2 parts, both are also part of a large travel from Cahokia, in North America to Uruguay, where he founded Madrid again.
To learn about DON's exploration of the Amazon, read Spanish Exploration of the Amazon.