1. Nile (North/East Africa) - 4,135 miles

"Nile Sunset" by Luciano Gollini

2. Amazon (South America) - 3,980 miles

San Rafael Falls, Quijos River, Amazon

"Foggy morning in an Amazon River village" by Todd Adams

3. Yangtze (China) - 3,917 miles

"Sad Yangtze" by Stan Zimny

Yangtze River Waterfalls

"Along the way down the Yangtze" by Aloysius Ho

4. Mississippi-Missouri (USA) - 3,870 miles

Mississippi River, McGregor, Iowa

Mouth of the Mississippi River

5. Yenisey (Russia) - 3,434 miles

"Yenisey" by Andrey Pivovarov

"Yenisey" by aleksandr.voyn

"Yenisey" by non_divine

6. Huang He/Yellow River (China) - 3,395 miles

"Bridge across the Yellow River" by Dennis Deng

"To Tong Ren" by Ian Riley

"Strangely shaed mountain" by jameshkwong

7. Ob-Irtysh (Russia) - 3,354 miles

"On fishing" by Veniamin Tropeznikov