Rivers of the World

A number of notable rivers wind through many different countries which become a source of survival to people and a significant component in the ecosystem to various species, both flora and fauna. Here are some of the world's longest flowing rivers:
Nile (4,132 mi/ 6,650 km)
Source: Tributaries of Lake Victoria in Amazon; outflow: Mediterranean Sea
The world’s longest river winds through ten countries: Sudan, Ethiopia, Egypt, Uganda, Tanzania, Kenya, Rwanda, Burundi, Democratic Republic of Congo, Eritrea. It has two branches: White Nile, the longer branch of the river which extends through Lake Victoria and finally to the delta in the Mediterranean; while the Blue Nile flows from The Ethiopian Highlands, merges with the longer branch and contributes to a large part of Egypt. It sustains the life of a variety of amphibians, birds, and over 300 fish species. It also acts as a breeding ground for endangered marine turtles, is a bird migration route, and has a human population living within the area, proving that the River Nile is undoubtedly a river of life.
Amazon (4,000 mi/ 6,400 km)
Source: Glacier-fed lakes, Peru; outflow: Atlantic Ocean
During the early times, this river served as a primary thoroughfare to the interiors of Brazil and northern half of South America. Carrying more water than any other river in the world, the Amazon River is a habitat, including its various waterways and ecosystems such as swamps, marshes, and streams.
Mississippi (2,340 mi/ 3,766 km)
Source: Lake Itasca, Minnesota; outflow: Gulf of Mexico
Apart from being a habitat for immense biodiversity production as well as acting as a migration route for birds and fishes, America’s major waterway has also contributed vastly to its economy. The river's drainage basin (around 3,188,290 sq km in size) trails off into a majority of the 31 states along with two provinces in Canada - Alberta and Saskatchewan. Shrimps, crabs, and alligators (found in isolated backwaters) thrive in this river including significant varieties of fish like catfishes, walleyes, and suckers. Nowadays, the river has also become a recreational destination offering lovers of the outdoors an experience not only of its vast waters but also the wildlife that surrounds it.
Yangtze (3,915 mi/ 6,300 km)
Source: Tibetan plateau, China; outflow: China Sea
Also called Chang Jiang, which means “long river”, the Yangtze River flows from the Qinghai Province on Tibetan plateau straight to the East China Sea and finally courses to the open in Shanghai. This served as a route for transportation and commercial purposes with its basin possessing a vast biodiversity of fishes, crabs, amphibians, and critically endangered species like crocodiles (found in the lower reaches), the Giant Panda, the largest salamander, and more.
Mekong (2,700 mi/ 4,350 km)
Source: Tibetan Highlands; outflow: South China Sea
From the mountains of China's southeastern Qinghai province, Southeast Asia's longest river flows through Tibet and continues south while creating a border between Laos and Myanmar outflowing to the South China Sea. The Mekong River’s abundance of fish species, which number over a thousand, contributes greatly to the aquaculture livelihood of the areas it comprises.
Rio Grande (1,900 mi/ 3,060 km)
Source: San Juan Mountains, Colorado
Outflow: Gulf of Mexico
Flowing from San Juan’s Mountains of Colorado through New Mexico and forming a border between Texas and Mexico, the Rio Grande is the second longest river in the United States. It is known for its abundance of freshwater life, its high diversity of mollusks, and its role as a home to endemic bird species.
Danube (1,770 mi/ 2,850 km)
Source: Black Forest, Germany
Outflow: Black Sea
Its basin comprises 19 riparian countries including Albania, Bosnia and Herzegovina, Bulgaria, Croatia, Macedonia, Moldova, Romania, Serbia, Montenegro, Switzerland, Ukraine with 8 European Union member states (Austria, Czech Republic, Germany, Hungary, Italy, Poland, Slovakia, Slovenia). The Danube River hosts a wide variety of fish species and its delta on the Black Sea plays a significant role as an ecological area in Europe.