Here is the worlds longest rivers based on length

Length 6,693 km

• The Nile is the longest river in the world and  major river in Africa.
• The Nile river flows almost entirely through desert,from into Egypt.
• The Nile river has two major tributaries,the White Nile and Blue Nile.
  

Length 6,436 km

• The Amazon river is the second longest river in the world.
• the Amazon river of South America is the largest river in the world by volume, with total Amazon river flow greater than the next eight largest rivers combined.
• The Amazon river,which has the largest drainage basin in the world, acounts for apporximately on fifith of the worlds total river flow.
  

Length 5,463 km

• The Yangtze River is also called Chang Jiang River.Yangtze river is the longest riverin in Asia.It is located in China and also third longest river in the world.

• The Yangtze River flows from its source in Qinghai Province,eastwards into the East China Sea at Shanghai.
  

Length 5,463 km

• The Huang He also called Yellow river and Hwang Ho river is the fourth longest river in the world and second longest river in China.
• Originating in the Bayan Har Mountains in Qinghai Province in western China, it flows through nine province of China and empties into the Bohai Sea.
  

Length 5,410 km

• The Ob-Irtysh river from a major basin in Asia,encompassing most of Western Siberia and the Altay Mountains.
  

• Origin Altay Mountains
• Mouth Ob River

• Basin countries Russia,Kazakhstan,China,Mongolia

Length 4,415 km

• The Amur River or Heilong river is the worlds sixth longest river in the world,the border betwen the Russian Far East and Northeastern China.
• Countries Russia, China
• Mouth Pacific Ocean

Length 4,399 km

• The Lena river is the easternmost of the three great Siberian rivers that flow into the Arctic ocean.
• It is the seventh longest river in the world and has the 9th largest watershed.
• Country Russia
• Source Baikal Mountains,Irkutsk Oblast,Russia

Length 4,241 km

• The Congo River it the largest river in Western Central Africa and second longest river  in Africa
• Mouth Atlantic Ocean
• Basin countries Democratic Republic of the Congo,Central African Republic,Republic of Congo,Angola,Zambia,Tanzania,Burundi,Rwanda.

Length 4,241 km

The Mackenzie River originates in Great Slave Lake, in the Northwest Territories, and flows north into the Arctic Ocean.it is longest river in Canada and 9th longest river in the world.

countries Canada,Northwest Territiries

Siurce Grat Slave Lake, Northwest Territories,Canada

Mouth Mackenzie Delta

Length 4,183 km

• The Mekong River is one of the world's major rivers.it is the 10th longest river in the world and seventh longest river in Asia.
• Countries China,Burma,Thailand,Laos,Cambodia,Vietnam
• Mouth Mekong Delta