Top ten countries with the largest coastline -
1 Canada 202,080 2 Indonesia 54,716 3 Greenland (Denmark) 44,087 4 Russia 37,653 5 Philippines 36,289 6 Japan 29,751 7 Australia 25,760 8 Norway 25,148 9 United States 19,924 10 New Zealand 15,134
Australia's coastline is 25,760 kilometers, or a little over 16,000 miles, long. No. It is not the longest in the world. Canada is the country with the longest coastline (152,100 miles) and Monaco has the shortest coastline (3.5 miles).