1:River Nile
Nile is, consider as world’s longest river, river in northeast Africa. Rive Nile is approximately 4132 miles long (6650 km approx).
2:Amazon River
River Amazon is largest river system of the world and is longest river in South America, according to its basin and the volume it is on top among all rivers of the world.
It measures, in length, approximately 4000 miles i.e. 6400 km approx. its basin includes Bolivia, Brazil, Colombia, Ecuador, Venezuela and Peru. The Amazonia, basin of river Amazon, is has an area of about 2.3 million square miles that makes approx 6 million kilometers.
3:Mississippi - Missouri
River Mississippi is draining major tributaries, of North America, of an area approximately 1.2 million square miles which make something like 3.1 million square kilometers, which makes 12.5% of the entire continent.
This river flows completely in United States of America. This river drains, including two provinces of Canada, all 31 parts of United States of America. It is one the busiest commercial waterways of the world.
4:Ob-Irtysh
The Ob-Irtysh is the world's seventh-longest river at 3,354 miles long. It begins at the junction of the Biya and Katun rivers, in the Altai Mountains, and flows through Siberia to the Gulf of Ob. It is made up of the Ob, the main river, and the Irtysh, its main tributary. Geographers most often refer to the two together, as the Ob-Irtysh River. Other large tributaries include the Tom, the Chulym, the Ket, the Tym, the Vakh, the Vasyugan, and the Sosva. But only the Irtysh, as the main tributary, gets its name in the title.
5:Chang Jiang (Yangtze)
Coursing over a distance of 6,380 kilometers, the mighty Chang Jiang, meaning "Long River", is the longest river in China and Asia and the third longest in the world after the Amazon in South America and the Nile in Africa. Also called the Yangtze River, it is like the Huang He in that it is a cradle of the ancient Chinese people.