It is somewhat problematic to define how long or large a river is in different time periods depending on different water levels, and it can be difficult to determine where the river begins and ends because it's a changing natural phenomenon that is constantly changing shape.
This means that there are slightly different versions of this list, but it seems that most geographers believe that the Nile is the longest, although researchers have shown new measurements where the Amazon should actually be longer.
This list comes from Wikipedia and lists the 10 longest rivers in the world.
10. Amur - Russia, China, Mongolia
Length: 4444 km
Outlet: Sea of Okhotska (Pacific Ocean)
9. Congo - Central Africa
Length: 4700 km
Outlet: Atlantic Ocean
8. Paraná - South America
Length: 4880 km
Outlet: Silver River (Atlantic Ocean)
7. Ob / Irtysh - Russia, Kazakhstan, China, Mongolia
Length: 5410 km
Outlet: Northern Arctic Ocean
6. Huanghe (Yellow River) - China
Length: 5464 km
Outlet: Bohai Sea (Yellow Sea)
5. Yenisei-Angara-Selenga - Russia, Mongolia
Length: 5539 km
Outlet: Cara Sea (Northern Arctic Ocean)
4. Mississippi / Missouri - USA
Length: 6275 km
Outlet: Gulf of Mexico
3. Yangtze River - China
Length: 6300 km
Outlet: East China Sea (Pacific Ocean)
2. The Amazon - South America
Distance: 6400 km
Outlet: Atlantic Ocean
1. The Nile - Northeast Africa
Length: 6650 km
Outlet: Mediterranean Sea
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Nature