The length of a river is determined after calculating the length between its source and its mouth. The rivers are the main source of fresh water, food, irrigation and hydrological benefits. Our lovely planet has magnificent rivers which normally fall ultimately into the oceans, seas or other rivers. Rivers are home of many aquatic species and they provide us with a tremendous source of food as fish.

There are almost 180 rivers of the lovely planet earth, which have the  length of more than 1,000 K.m. Following are the images of the top 25 longest rivers of the lovely planet ;

1- River Nile of North East Africa ( 6,650 K.m )

River Nile at night ( Image: Mohamed Ahmed Kazzaz )

2- Amazon River of South America ( 6,400 K.m )

Amazon River with its rainforests ( Image : CIFOR )

3- Yangtze River of China ( 6,300 K.m)

Yangtze River of China ( Photographer: Stanley Zimny )

4- Mississippi River of the United States of America ( 6,200 K.m )

Mississippi River of US ( Image: By Creativity Corner )

5- Yenisei River of Russia ( 5,500 K.m )

Yenisei River of Russia ( atom57 image on flickr )

6- Yellow River (Huang He) of China ( 5,450 K.m )

Yellow River of China

7- Ob River of Russia ( 5,400 K.m )

Ob River in Russia ( Image by Alexei Ebel )

8- Parana River of Brazil ( 4,800 K.m )

Parana River of Brazil ( Luis Argerich's Image )

9- Congo River of Central Africa ( 4,700 K.m )

Congo River of Central Africa ( By Dan Balluff )

10- Amur River ( Russia, China & Mongolia - 4,450 K,m )

Amur River ( Russia, China , Mongolia ) By Martin Lopatka

11- Lena River ( Siberia – Russia – 4,400 K.m )

Lena River of Siberia, Russia ( By: Bolotbootur )

12- Mekong River of South East Asia ( 4,350 K.m )

Mekong River of South East Asia ( Jean-Marie Hullot's Image )

13- Mackenzie River of Canada  ( 4,250 K.m )

Mackenzie River of Canada ( TonyG22 's Image )

14- Niger River of North Africa ( 4,200 K.m )

Niger River of North Africa ( Jamie Geysbeek's Image )

15- Murray River of Australia ( 3,670 K.m )

Murray River of Australia ( Image: By FreakyNami )

16- Tocantins River of Brazil ( 3, 650 K.m )

Tocantins River of Brazil ( By: Guilherme Figueiredo Quadros )

17- Volga River of Russia ( 3,640 K.m )

Volga River of Russia ( By: Viking River Cruises )

18- Shatt-al-Arab River ( Iraq, Turkey, Syria ) – 3,590 K.m

Shatt-al-Arab River ( Iraq, Turkey, Syria ) Image: James Birt

19- Maderia River ( Brazil, Peru, Bolivia ) – 3,370 K.m

Maderia River ( Brazil, Bolivia, Peru )

20- Purus River ( Brazil, Peru ) – 3,211 K.m

Purus River ( Lµiz Felipe's Image )

21- Yukon River ( U.S.A & Canada ) – 3,190 K.m

Yukon River of U.S.A & Canada

22- Indus River of Pakistan - 3,180 K.m

Indus River of Pakistan ( Some portion in China & India ) Sayid Budhi's Image

23- Sao Francisco River of Brazil - 3,170 K.m

Sao Francisco River ( By: IngeKühn ) Brazil

24- Syr Darya River ( Kazakhstan, Kyrgyzstan, Uzbekistan, Tajikistan ) – 3,070 K.m

Syr Darya River ( Kazakhstan, Kyrgyzstan, Uzbekistan, Tajikistan ) Julio Aprea's Image

25- Salween River or Nu Jiang River ( China, Myanmar, Thailand ) – 3,060 K.m

Nu jiang River or Salveen River ( A Lucy Young's Image )