| Afon | Hyd (km) | Dalgylch (km²) | Llif cyfartaledd (m³/eiliad) | Yn llifo i | Gwledydd yn y dalgylch |
|---|
| 1. | Afon Amazonas * | 7040 | 6915000 | 219000 | Cefnfor Iwerydd | Brasil,Periw,Bolifia,Colombia,Ecwador,Feneswela. |
| 2. | Nîl * | 6671 | 3400000 | 5100 | Y Môr Canoldir | Ethiopia,Eritrea,Swdan,Wganda,Tansanïa,Cenia,Rwanda,Bwrwndi,Yr Aifft,Gweriniaeth Ddemocrataidd y Congo. |
| 3. | Mississippi -Missouri -Jefferson | 6270 (6420) | 2980000 | 16200 | Gwlff Mecsico | Unol Daleithiau America,Canada |
| 4. | Yangtze (Chang Jiang) | 6211 (5797) | 1800000 | 31900 | Môr Dwyrain China | Gweriniaeth Pobl Tsieina |
| 5. | Yenisei -Angara -Selenga | 5550 (4506) | 2580000 | 19600 | Môr Kara | Rwsia,Mongolia |
| 6. | Huang He (Yr Afon Felen) | 5464 (4667) | 745000 | 2571 | Môr Bohai (Balhae) | Gweriniaeth Pobl Tsieina |
| 7. | Ob' -Irtysh | 5410* | 2990000 | 12800 | Gwlff Ob | Rwsia,Casachstan,Gweriniaeth Pobl Tsieina |
| 8. | Amur (Heilong Jiang) | 4368* | 1855000 | 11400 | Môr Okhotsk | Rwsia,Gweriniaeth Pobl Tsieina,Mongolia |
| 9. | Congo (Zaire) | 4371 (4670) | 3680000 | 41800 | Cefnfor Iwerydd | Gweriniaeth Ddemocrataidd y Congo,Gweriniaeth Canolbarth Affrica,Angola,Gweriniaeth y Congo,Tansanïa,Camerŵn,Sambia,Bwrwndi,Rwanda |
| 10. | Lena | 4260 (4400) | 2490000 | 17100 | Môr Laptev | Rwsia |
| 11. | Mackenzie -Peace -Finlay | 4241 (5427) | 1790000 | 10300 | Môr Beaufort | Canada |
| 12. | Niger | 4167 (4138*) | 2090000 | 9570 | Gwlff Gini | Nigeria,Mali,Niger,Algeria,Gini,Camerŵn,Bwrcina Ffaso,Arfordir Ifori,Benin,Tsiad |
| 13. | Mekong (Lancang Jiang) | 4023 | 810000 | 16000 | Môr De China | Laos,Gwlad Tai,Gweriniaeth Pobl Tsieina,Cambodia,Fietnam,Myanmar |
| 14. | Paraná (Río de la Plata) | 3998 (4700) | 3100000 | 25700 | Cefnfor Iwerydd | Brasil,Ariannin,Paragwái,Bolifia,Wrwgwái |
| 15. | Murray -Darling | 3750 (3520) | 1061000 | 767 | Cefnfor y De | Awstralia |
| 16. | Volga | 3645* | 1380000 | 8080 | Môr Caspia | Rwsia |
| 17. | Shatt al-'Arab /Arvandrud -Ewffrates | 3596 (2992) | 884000 | 856 | Gwlff Persia | Irac,Twrci,Iran,Syria |
| 18. | Purus | 3379 (2948) (3210) | 63166 | 8400 | Afon Amazonas | Brasil,Periw |
| 19. | Madeira -Mamoré | 3239 | 850000 | 17000 | Afon Amazonas | Brasil,Bolifia,Periw |
| 20. | Yukon | 3184 | 850000 | 6210 | Môr Bering | Unol Daleithiau America,Canada |
| 21. | Indus (Sindhu) | 3180 | 960000 | 7160 | Môr Arabia | Pacistan,India,Gweriniaeth Pobl Tsieina,Affganistan |
| 22. | São Francisco | 3180* (2900) | 610000 | 3300 | Cefnfor Iwerydd | Brasil |
| 23. | Syr Darya -Naryn | 3078 | 219000 | 703 | Môr Aral | Casachstan,Cirgistan,Wsbecistan,Tajicistan |
| 24. | Salawin (Nu Jiang) | 3060 | 324000 | 3153 | Môr Andaman | Gweriniaeth Pobl Tsieina,Myanmar,Gwlad Tai |
| 25. | St Lawrence -Llynnoedd Mawr | 3058 | 1030000 | 10100 | Gwlff St Lawrence | Canada,Unol Daleithiau America |
| 26. | Rio Grande | 3057 (2896) | 570000 | 82 | Gwlff Mecsico | Unol Daleithiau America,Mecsico |
| 27. | Tunguska Isaf | 2989 | 473000 | 3600 | Yenisei | Rwsia |
| 28. | Brahmaputra | 2948* | 1730000 | 19200 | Bae Bengal | India,Gweriniaeth Pobl Tsieina,Nepal,Bangladesh,Bhwtan |
| 29. | Donaw | 2850* | 817000 | 7130 | Y Môr Du | Yr Almaen,Awstria,Slofacia,Hwngari,Croatia,Serbia,Bwlgaria,Rwmania,Moldafa,Wcráin |
| 30. | Afon Ewffrates | 2760 | 765831 | 818 | Gwlff Persia | Twrci,Syria,Irac |
| 31. | Tocantins | 2699 | 1400000 | 13598 | Cefnfor Iwerydd,Afon Amazonas | Brasil |
| 32. | Zambezi (Zambesi) | 2693* | 1330000 | 4880 | Culfor Mosambîc | Sambia,Angola,Simbabwe,Mosambic,Malawi,Tansanïa,Namibia,Botswana |
| 33. | Viljuj | 2650 | 454000 | 1480 | Lena | Rwsia |
| 34. | Araguaia | 2627 | 358125 | 6172 | Tocantins | Brasil |
| 35. | Amu Darya | 2620 | 534739 | 1400 | Môr Aral | Wsbecistan,Tyrcmenistan,Tajicistan,Affganistan |
| 36. | Caquetá (Rio Yapurá neu Japurá) | 2615* | 242259 | 6000 | Afon Amazonas | Brasil,Colombia |
| 37. | Nelson -Saskatchewan | 2570 | 1093000 | 2575 | Bae Hudson | Canada |
| 38. | Paragwái (Rio Paraguay) | 2549 | 900000 | 4300 | Paraná | Brasil,Paragwái,Bolifia,Ariannin |
| 39. | Kolyma | 2513 | 644000 | 3800 | Môr Siberia Dwyreiniol | Rwsia |
| 40. | Ganga | 2510 | 907000 | 12037 | Brahmaputra,Bae Bengal | India,Bangladesh,Nepal |
| 41. | Pilcomayo | 2500 | 270000 | | Paragwái | Paragwái,Ariannin,Bolifia |
| 42. | Ob' Uchaf | 2490 | | | Ob | Rwsia |
| 43. | Išim | 2450 | 177000 | 56 | Irtyš | Casachstan,Rwsia |
| 44. | Jurua | 2410 | 200000 | 6000 | Afon Amazonas | Periw,Brasil |
| 45. | Wral | 2428 | 237000 | 475 | Môr Caspia | Russia,Casachstan |
| 46. | Arkansas | 2348 | 505000 (435122) | | Mississippi | Unol Daleithiau America |
| 47. | Ubangi -Uele | 2300 | | | Congo | Gweriniaeth Ddemocrataidd y Congo,Gweriniaeth Canolbarth Affrica |
| 48. | Olenëk | 2292 | | | Môr Laptev | Rwsia |
| 49. | Dnieper | 2287 | 516300 | 1670 | Môr Du | Rwsia,Bielorussia,Wcrain |
| 50. | Aldan | 2273 | | | Lena | Rwsia |
| 51. | Rio Negro | 2250 | | | Afon Amazonas | Brasil,Feneswela,Colombia |
| 52. | Columbia | 2250 (1953) | 415211 | 7400 | Cefnfor Tawel | Unol Daleithiau, Canada |
| 53. | Colorado | 2333 | 390000 | 1200 | Gwlff Califfornia | Unol Daleithiau, Mecsico |
| 54. | Pearl -Xi Jiang | 2200 | 437000 | 13600 | Mar Cinese Meridionale | Tsieina,Fietnam |
| 55. | Red | 2188 | | | Mississippi | Unol Daleithiau |
| 56. | Irrawaddy (Irrawaddi neu Ayeyarwady ) | 2170 | 411000 | 13000 | Môr Andaman | Myanmar |
| 57. | Kasai | 2153 | | | Congo | Angola,Gweriniaeth Ddemocratiaidd y Congo |
| 58. | Ohio -Allegheny | 2102 | 490603 | | Mississippi | Unol Daleithiau |
| 59. | Orinoco | 2101 | 880000 | 30000 | Cefnfor Iwerydd | Feneswela, Colombia |
| 56. | Tarim | 2100 | | | Lop Nor | Gweiniaeth Pobl Tsieina |
| 61. | Xingu | 2100 | | | | Brasil |
| 62. | Oren | 2092 | | | Cefnfor Iwerydd | De Affrica,Namibia,Botswana,Lesotho |
| 63. | Salado Ogleddol | 2010 | | | Paraná | Ariannin |
| 64. | Vitim | 1978 | | | Lena | Rwsia |
| 65. | Tigris | 1950 | | | Shatt al-'Arab | Twrci,Irac,Syria,Iran |
| 66. | Songhua | 1927 | | | Amur | Gweriniaeth Pobl Tsieina |
| 67. | Tapajós | 1900 | | | | Brasil |
| 68. | Don | 1870 | | | Môr Azov | Russia |
| 69. | Angara | 1865 | | | Yenisei | Rwsia |
| 70. | Pechora | 1809 | 322000 | | Môr Barents | Rwsia |
| 71. | Kama | 1805 | 507000 | | Volga | Russia |
| 72. | Afon Limpopo | 1800 | | | Cefnfor India | Mosambic,Simbabwe,De Affrica,Botswana |
| 73. | Guaporé | 1749 | | | Mamoré | Brasil, Bolifia |
| 74. | Indigirka | 1726 | | | Mare della Siberia Orientale | Rwsia |
| 75. | Snake | 1670 | | | Columbia | Unol Daleithiau America |
| 76. | Senegal | 1641 | 419659 | | Cefnfor Iwerydd | Senegal,Mali,Mauritania |
| 77. | Wrwgwái | 1610 | | | Cefnfor Iwerydd | Wrwgwái, Ariannin, Brasil |
| 78. | Afon Nîl Las | 1600 | | | Nîl | Ethiopia,Swdan |
| 79. | Churchill | 1600 | | | Bae Hudson | Canada |
| 80. | Chatanga | 1600 | | | Môr Laptev | Rwsia |
| 81. | Okavango | 1600 | | | Delta Okavango | Namibia,Angola,Botswana |
| 82. | Volta | 1600 | | | Gwlff Gini | Ghana,Bwrcina Ffaso,Togo,Costa d'Avorio,Benin |
| 83. | Beni | 1599 | | | Madeira | Bolifia |
| 84. | Platte | 1594 | | | Missouri | Unol Daleithiau |
| 85. | Tobol | 1591 | | | Irtysh | Casachstan, Rwsia |
| 86. | Jubba -Uebi Scebeli | 1580* | | | Cefnfor India | Ethiopia,Somalia |
| 87. | Putumayo | 1575 | | | | Brasil, Periw, Colombia, Ecwador |
| 88. | Magdalena | 1550 | | | Môr y Caribî | Colombia |
| 89. | Han | 1532 | | | Yangtze | Tsieina |
| 90. | Lomami | 1500 | | | Congo | Gweriniaeth Ddemocrataidd y Congo |
| 91. | Oka | 1500 | | | Volga | Rwsia |
| 92. | Pecos | 1490 | | | Rio Grande | Unol Daleithiau |
| 93. | Yenisei uchaf | 1480 | | | Yenisei | Rwsia, Mongolia |
| 94. | Godavari | 1465 | | | Bae Bengal | India |
| 95. | Colorado (Texas) | 1438 | | | Gwlff Mecsico | Unol Daleithiau |
| 96. | Río Grande(Guapay) | 1438 | | | Ichilo | Bolifia |
| 97. | Belaya | 1420 | | | Kama | Russia |
| 98. | Cooper -Barcoo | 1420 | | | Llyn Eyre | Awstralia |
| 99. | Marañón | 1415 | | | | Periw |
| 100. | Dniester | 1411 (1352) | | | Môr Du | Wcrain,Moldafia |
| 101. | Benue | 1400 | | | Niger | Camerŵn,Nigeria |
| 102. | Ili (Yili) | 1400 | | | Llyn Baikhal | Tsieina, Casachstan |
| 103. | Warburton -Georgina | 1400 | | | Llyn Eyre | Awstralia |
| 104. | Yamuna | 1376 | | | Ganga | India |
| 105. | Sutlej | 1370 | | | Chenab | Tsieina, India, Pacistan |
| 106. | Vyatka | 1370 | | | Kama | Rwsia |
| 107. | Fraser | 1368 | | | Cefnfor Tawel | Canada |
| 108. | Kura | 1364 | | | Môr Caspia | Aserbaijan,Georgia,Armenia,Twrci,Iran |
| 109. | Rio Grande (Paraná) | 1360 | | | Paraná | Brasile |
| 110. | Brazos | 1352 | | | Gwlff Mecsico | Unol Daleithiau |
| 111. | Liao | 1345 | | | Môr Bohai | Cina |
| 112. | Yalong | 1323 | | | Yangtze | Tsieina |
| 113. | Iguazú | 1320 | | | Paraná | Brasil, Ariannin |
| 114. | Olëkma | 1320 | | | Lena | Rwsia |
| 115. | Rhein | 1320 | 144055 | | Môr y Gogledd | Yr Almaen,Ffrainc,Y Swistir,Yr Iseldiroedd,Awstria,Lwcsembwrg,Liechtenstein |
| 116. | Krishna | 1300 | | | Bae Bengal | India |
| 117. | Iriri | 1300 | | | Afon Xingu | Brasil |
| 118. | Narmada | 1289 | | | Môr Arabia | India |
| 119. | Ottawa | 1271 | | | Afon St Lawrence | Canada |
| 120. | Zeja | 1242 | | | Amur | Rwsia |
| 121. | Juruena | 1240 | | | Tapajós | Brasil |
| 122. | Mississippi uchaf | 1236 | | | Mississippi | Unol Daleithiau |
| 123. | Athabasca | 1231 | | | Mackenzie | Canada |
| 124. | Canadian | 1223 | | | Arkansas | Unol Daleithiau |
| 125. | North Saskatchewan | 1220 | | | Saskatchewan | Canada |
| 126. | Vaal | 1210 | | | Orange | De Affrica |
| 127. | Shire | 1200 | | | Zambezi | Mosambic,Malawi |
| 126. | Nen (Nonni) | 1190 | | | Songhua | Tsieina |
| 127. | Green | 1175 | | | Colorado | Unol Daleithiau |
| 128. | Milk | 1173 | | | Missouri | Unol Daleithiau, Canada |
| 129. | Elbe | 1162* | | | Môr y Gogledd | Yr Almaen,Gweriniaeth Tsiec |
| 130. | Chindwin | 1158 | | | Irrawaddy | Myanmar |
| 131. | James | 1143 | | | Missouri | Unol Daleithiau |
| 131. | Kapuas | 1143 | | | Môr De Isieina | Indonesia |
| 133. | Helmand | 1130 | | | Hamun-i-Helmand | Affganistan,Iran |
| 133. | Madre de Dios | 1130 | | | Madeira | Periw, Bolifia |
| 133. | Tietê | 1130 | | | Paraná | Brasil |
| 133. | Vycegda | 1130 | | | Dvina Settentrionale | Rwsia |
| 137. | Sepik | 1126 | 77700 | | Cefnfor Tawel | Papua Gini Newydd,Indonesia |
| 138. | Cimarron | 1123 | | | Arkansas | Unol Daleithiau |
| 139. | Anadyr' | 1120 | | | Gwlff Anadyr' | Rwsia |
| 140. | Liard | 1115 | | | Mackenzie | Canada |
| 141. | White | 1102 | | | Mississippi | Unol Daleithiau |
| 142. | Huallaga | 1100 | | | Marañón | Periw |
| 143. | Gambia | 1094 | | | Cefnfor Iwerydd | Gambia,Senegal,Gini |
| 144. | Chenab | 1086 | | | Indus | India, Pacistan |
| 145. | Yellowstone | 1080 | | | Missouri | Unol Daleithiau |
| 146. | Donets | 1078 (1053) | | | Don | Wcrain, Rwsia |
| 147. | Bermejo | 1050 | | | Paragwái | Ariannin, Bolifia |
| 147. | Fly | 1050 | | | Gwlff Papua | Papua Gini Newydd,Indonesia |
| 147. | Guaviare | 1050 | | | Orinoco | Colombia |
| 147. | Kuskokwim | 1050 | | | Môr Bering | Unol Daleithiau |
| 151. | Tennessee | 1049 | | | Ohio | Unol Daleithiau |
| 152. | Daugava | 1020 | | | Gwlff Riga | Lithwania,Belarws, Russia |
| 153. | Gila | 1015 | | | Colorado | Unol Daleithiau |
| 154. | Vistula | 1014 | | | Y Môr Baltig | Gwlad Pwyl |
| 155. | Loire | 1012 | | | Cefnfor yr Iwerydd | Ffrainc |
| 156. | Essequibo | 1010 | | | Oceano Atlantico | Gaiana |
| 156. | Chopër | 1010 | | | Don | Rwsia |
| 158. | Tagus | 1006 | | | Cefnfor Iwerydd | Sbaen,Portiwgal |
| 159. | Colorado (Ariannin) | 1000 | | | Cefnfor Iwerydd | Ariannin |