Source of the Amazon River the Mantaro. Explorers and scholars have identified each of the three rivers as being the source of the Amazon under one of the three definitions. The Mantaro is the most distant upstream point; the Maraňón is the main stem of the Amazon; and the Apurímac is the most distant source with an uninterrupted flow of water. The Amazon River is the largest river in the world in terms of its discharge into the Atlantic Ocean and either the longest or second longest river in the world, contending with the Nile River for that honor. More than from its mouth, upstream
Susquehanna River Susquehanna River The Susquehanna River (; Lenape: Siskëwahane) is a major river located in the northeastern and mid-Atlantic United States. At long, it is the longest river on the East Coast of the United States that drains into the Atlantic Ocean. With its watershed, it is the 16th-largest river in the United States, and the longest river in the early 21st-century continental United States without commercial boat traffic. It is the longest unnavigable river in the world. The Susquehanna River forms from two main branches: the "North Branch", which rises in Cooperstown, New York, and is regarded by federal mapmakers