| Border | Answer | % Correct |
|---|---|---|
| France/Italy | Alps | 88%
|
| Chile/Argentina | Andes | 84%
|
| USA/Mexico | Rio Grande | 83%
|
| India/China | Himalayas | 80%
|
| Spain/Morocco | Strait of Gibraltar | 79%
|
| Ukraine/Turkey | Black Sea | 77%
|
| UK/France | English Channel | 77%
|
| France/Spain | Pyrenees | 76%
|
| Sudan/Saudi Arabia | Red Sea | 76%
|
| Romania/Bulgaria | Danube | 66%
|
| Australia/New Zealand | Tasman Sea | 58%
|
| Azerbaijan/Turkmenistan | Caspian Sea | 57%
|
| Mongolia/China | Gobi Desert | 56%
|
| USA/Russia | Bering Sea | 52%
|
| Germany/Switzerland | Rhine | 52%
|
| Poland/Slovakia | Carpathians | 25%
|
| D.R.of the Congo/Tanzania | Lake Tanganyika | 19%
|
| China/North Korea | River Yalu | 15%
|
| Malaysia/Singapore | Straits of Johor | 10%
|
| Mexico/Belize | River Hondo | 7%
|