| Miles | Kilometers | |
1 | Nile (Africa) | | |
2 | Amazon (S. America) | | |
3 | Chang Jiang (Yangtze) (China) | | |
4 | Huang He (Yellow River) (China) | | |
5 | Ob-Irtysh (Russia) | | |
6 | Amur (Asia) | | |
7 | Lena (Russia) | | |
8 | Congo (Africa) | | |
9 | MacKenzie (Canada) | | |
10 | Mekong (Viet Nam) | | |
11 | Niger (Africa) | | |
12 | Yenisey (Russia) | | |
13 | Parana (S. America) | | |
14 | Mississippi (U.S.) | | |
15 | Missouri (U.S.) | | |
16 | Murray-Darling (Australia) | | |
17 | Volga (Russia) | | |
18 | Purus (Brazil) | | |
19 | Madeira (Brazil) | | |
20 | Sao Francisco (Brazil) | | |