| River | Tributary | % Correct |
|---|---|---|
| Nile | White Nile | Blue Nile | Adar | Achwa | Atbarah | Bahr el Ghazal | Sobat | 89%
|
| Mississippi | St. Croix | Wisconsin | Rock | Illinois | Kaskaskia | Ohio | Yazoo | Big Black | Minnesota | Des Moines | Missouri | White | Arkansas | Ouachita | Red | Atchafalaya | 83%
|
| Murray | Mitta | Mitta | Kiewa | Ovens | Goulburn | Campaspe | Loddon | Swampy | Plains | Murrumbidgee | Darling | 40%
|
| Columbia | Spillimacheen | Beaver | Illecillewaet | Incomappleux | Kootenay | Pend Oreille | Spokane | Crab Creek | Snake | John Day | Deschutes | Willamette | Kicking Horse | Blaeberry | Canoe | Kettle | Sanpoil | Okanogan | Entiat | Wenatchee | Yakima | Lewis | Cowlitz | 40%
|
| Amazon | Marañón | Napo | Japurá | Caquetá | Rio Negro | Guainía | Putumayo | Trombetas | Ucayali | Javary | Juruá | Purús | Madeira | Tapajós | Xingu | 36%
|
| Danube | Iller | Wörnitz | Zusam | Lech | Paar | Abens | Altmühl | Hopfenbach | Schwarze Laber | Naab | Regen | Sulzbach | Otterbach | Pfatter | Wiesent | Große Laber | Sava | Aiterach | Kinsach | Isar |Hengersberger Ohe | Angerbach | Vils | Gaißa | Ilz | Inn | +154 more | 34%
|
| Seine | Yonne | Loing | Eure | Risle | Ource | Aube | Marne | Oise | Epte | 21%
|
| Thames | Churn | Leach | Cole | Coln | Windrush | Evenlode | Cherwell | Ock | Thame | Pang| Kennet | Loddon | Colne | Wey | Mole | Brent | Wandle | Effra | Westbourne | Fleet | Ravensbourne | 18%
|
| Colorado | Fraser | Blue | Eagle | Roaring Fork | Gunnison | Dolores | San Juan | Little Colorado | Bill Williams | Gila | Green | Dirty Devil | Escalante | Kanab | Virgin | Hardy | 17%
|
| Volga | Kama | Oka | Sura | Vetluga | 13%
|
| Ganges | Yamuna | Tamsa | Son | Punpun | Falgu | Kiul | Karamnasa | Chandan | Ajoy | Damodar | Rupnarayan | Ramganga | Garra | Gomti | Ghaghara | Gandak | Burhi | Koshi | Mahananda | Bramhaputra | 12%
|
| Yellow | White | Black | Huang Shui | Datong | Daxia | Tao | Zuli | Qingshui | Dahei | Kuye | Wuding | Fen | Wei | Luo | Qin | Dawen | Kuo | 5%
|