| Length | Countries | Answer | % Correct |
|---|---|---|---|
| 3976 mi | Brazil, Colombia, Peru | Amazon | 100%
|
| 4132 mi | DR Congo, South Sudan, Sudan, Kenya, Burundi, Ethiopia, Eritrea, Egypt, Tanzania, Rwanda, Uganda | Nile | 100%
|
| 29029 ft | Nepal, China | Everest | 88%
|
| 28251 ft | Pakistan, China | K2 | 88%
|
| 3902 mi | United States | Mississippi | 88%
|
| 3395 mi | China | Yellow | 88%
|
| 2922 mi | DR Congo, Gabon, Cameroon, Burundi, Zambia, Angola, Central African Republic, Congo, Tanzania, Rwanda | Congo | 81%
|
| 26828 sq mi | Tanzania, Uganda, Kenya | Victoria | 81%
|
| 22000 sq mi | United States | Michigan | 77%
|
| 9930 sq mi | United States, Canada | Erie | 73%
|
| 23000 sq mi | United States, Canada | Huron | 73%
|
| 7520 sq mi | United States, Canada | Ontario | 73%
|
| 3917 mi | China | Yangtze | 73%
|
| 143000 sq mi | Azerbaijan, Iran, Kazakhstan, Russia, Turkmenistan | Caspian Sea | 69%
|
| 2611 mi | Nigeria, Mali, Niger, Benin, Guinea | Niger | 69%
|
| 31820 sq mi | United States, Canada | Superior | 69%
|
| 12200 sq mi | Russia | Baikal | 65%
|
| 2266 mi | Russia | Volga | 65%
|
| 2705 mi | Thailand, Cambodia, Laos, China, Myanmar, Vietnam | Mekong | 62%
|
| 12000 sq mi | Canada | Great Bear Lake | 54%
|
| 2282 mi | Australia | Murray | 54%
|
| 11600 sq mi | Malawi, Mozambique, Tanzania | Malawi | 50%
|
| 3141 sq mi | Bolivia, Peru | Titicaca | 50%
|
| 11170 sq mi | Canada | Great Slave Lake | 46%
|
| 3364 mi | Russia | Ob | 42%
|
| 9094 sq mi | Canada | Winnipeg | 42%
|
| 3089 sq mi | Nicaragua, Costa Rica | Nicaragua | 38%
|
| 12700 sq mi | Burundi, DR Congo, Tanzania, Zambia | Tanganyika | 38%
|
| 1980 mi | Canada | Yukon | 38%
|
| 7000 sq mi | Russia, Finland | Ladoga | 35%
|
| 2736 mi | Russia | Lena | 35%
|
| 2637 mi | Canada | Mackenzie | 35%
|
| 2763 mi | China, Russia | Amur | 31%
|
| 3030 mi | Paraguay, Brazil, Argentina | Parana | 31%
|
| 26545 ft | Nepal | Annapurna I | 27%
|
| 26040 ft | Nepal | Annapurna II | 27%
|
| 3060 sq mi | Canada | Athabasca | 23%
|
| 3445 mi | Mongolia, Russia | Yenisei | 23%
|
| 28169 ft | Nepal, India | Kangchenjunga | 19%
|
| 27940 ft | Nepal, China | Lhotse | 19%
|
| 1976 mi | Brazil | Sao Francisco | 19%
|
| 6300 sq mi | Kazakhstan, China | Balkhash | 15%
|
| 26660 ft | Pakistan | Nanga Parbat | 15%
|
| 3819 sq mi | Russia | Onega | 15%
|
| 6060 sq mi | (Antarctica) | Vostok | 15%
|
| 26795 ft | Nepal | Dhaulagiri I | 12%
|
| 27838 ft | Nepal, China | Makalu | 12%
|
| 2270 mi | Brazil | Tocantins | 12%
|
| 26414 ft | Pakistan, China | Broad Peak | 8%
|
| 26864 ft | Nepal, China | Cho Oyu | 8%
|
| 26781 ft | Nepal | Manaslu | 8%
|
| 2236 mi | Iraq, Iran | Shatt al-Arab | 8%
|
| 25866 ft | Pakistan | Distaghil Sar | 4%
|
| 26509 ft | Pakistan, China | Gasherbrum I | 4%
|
| 26362 ft | Pakistan, China | Gasherbrum II | 4%
|
| 26024 ft | Pakistan, China | Gasherbrum IV | 4%
|
| 26089 ft | Nepal, China | Gyachung Kang | 4%
|
| 25896 ft | Nepal | Himalchuli | 4%
|
| 25823 ft | Nepal | Ngadi Chuli | 4%
|
| 26335 ft | China | Shishapangma | 4%
|