The term 'Great River' can refer to two different rivers, the AMAZON and the Nile. The AMAZON is a river in South America that is the largest river by discharge volume of water in the world. It is 6, 400 km long and flows through Brazil, Peru, Colombia, and other countries. The Nile is a river in Africa that is the longest river in the world at 6, 853 km. It flows through Egypt, Sudan, Ethiopia, and other countries.