| Country A | Country B | River | % Correct |
|---|---|---|---|
| Dem. Rep. of Congo | Rep. of Congo | Congo / Ubangui | 100%
|
| Bulgaria | Romania | Danube | 96%
|
| Germany | Switzerland | Rhine | 96%
|
| Mexico | United States (Texas) | Rio Grande | 96%
|
| Benin | Niger | Niger | 86%
|
| Mexico (Baja California) | United States (Arizona) | Colorado | 82%
|
| Israel / West Bank | Jordan | Jordan | 82%
|
| Zambia | Zimbabwe | Zambezi | 82%
|
| Namibia | South Africa | Orange | 75%
|
| Myanmar | Laos | Mekong | 68%
|
| Argentina | Uruguay | Uruguay | 68%
|
| Colombia | Peru | Putumayo / Amazon | 61%
|
| Bosnia and Herzegovina | Croatia | Sava | 46%
|
| Afghanistan | Uzbekistan | Amu Darya | 36%
|
| Belarus | Poland | Bug | 32%
|
| Belgium (Flanders) | Netherlands (Limburg) | Meuse | 32%
|
| Estonia | Russia | Narva | 21%
|
| Greece | Turkey | Maritsa | 14%
|
| China | North Korea | Yalu | 14%
|
| North Korea | Russia | Tumen | 11%
|