| Country | Length | Answer | % Correct |
|---|---|---|---|
| Australia | 1,429mi (2,300km) | Great Barrier Reef | 92%
|
| Egypt-Eritrea, Saudi Arabia | 1,240mi (2,000km) | Red Sea Coral Reef | 50%
|
| USA | 350mi (560km) | Florida Reef | 8%
|
| France | 930mi (1,500km) | New Caledonian barrier reef | 8%
|
| Mexico-Honduras | 625mi (1,006km) | Great Mayan Reef | 0%
|