| Letter | Coastline length (km) | Country | % Correct |
|---|---|---|---|
| C | 137,000 | Canada | 98%
|
| O | 2,290 | Oman | 98%
|
| U | 69,500 | United States | 98%
|
| I | 52,500 | Indonesia | 96%
|
| J | 15,500 | Japan | 96%
|
| Q | 543 | Qatar | 96%
|
| R | 73,100 | Russia | 96%
|
| A | 34,100 | Australia | 95%
|
| D | 48,800 | Denmark | 95%
|
| V | 5,780 | Vietnam | 95%
|
| Y | 2,540 | Yemen | 95%
|
| B | 18,700 | Brazil | 93%
|
| Z | 0 | Zambia, Zimbabwe | 93%
|
| P | 17,300 | Philippines | 91%
|
| F | 12,200 | France | 88%
|
| H | 1,510 | Honduras | 88%
|
| N | 27,400 | Norway | 86%
|
| M | 15,600 | Mexico | 84%
|
| S | 6,520 | Sweden | 79%
|
| T | 5,850 | Turkiye | 77%
|
| K | 1,170 | Kiribati | 75%
|
| E | 3,790 | Egypt | 72%
|
| G | 9,480 | Greece | 72%
|
| L | 1,780 | Libya | 68%
|