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
Mississippi River System and dumping the Mississippi River. Its length of 1,469 miles allows it to flow through Colorado, Kansas, Oklahoma, and Arkansas. It is the sixth longest river in the US, the second longest tributary to the Mississippi River System, and the 45th longest river in the world. The Illinois River is a principal tributary of the Mississippi River. The river runs approximately 273 miles (439 km) long, in the U.S. state of Illinois. This river was important among Native Americans and early French traders as the principal water route connecting the Great Lakes with the Mississippi. The Illinois River meets the