Coral grows (best) in warm water, and coral reefs in shallow, clear water (so it gets sun). So it's more a function of proximity to the right growing conditions than it is to total length of coastline.
Bit surprising that Belize is considered to have the second largest coral reef in the world but doesn't make the top 20 in terms of overall reef square mileage
I feel like as a Queenslander, if there's one thing we should know its coral. Pretty much the main reason anyone comes here - the Great Barrier Reef. Managed to get them all in the end with about 30 seconds remaining. I was stuck for a while, but Egypt was a breakthrough and gave me Eritrea and Saudi Arabia.
My finger was on E but for some reason i typed Sudan