By kilometers of coastline (according to the CIA World Factbook).

1. Canada – 202,080 km / 125,567 mi
2. Indonesia – 54,716 km / 33,998 mi
3. Russia – 37,653 km / 23,396 mi
4. Philippines – 36,289 km / 22548 mi
5. Japan – 29,751 km / 18,486 mi
6. Australia – 25,760 km / 16,006 mi
7. Norway – 25,148 km / 15,626 mi
8. United States – 19,924 km / 12,380 mi
9. New Zealand – 15,134 km / 9403 mi
10. China – 14,500 km / 9009 mi

Note: Greenland has 44,087 km of coastline but it is not yet a fully independent country.