Wakatobi Reef, Indonesia

Wakatobi Reef boasts the highest coral diversity of any reef on this list, with over 750 documented species—more than triple the average found in the Caribbean. This Indonesian national park in Southeast Sulawesi spans four main islands, offering pristine slopes where 30% of fish are endemic. Compared to Apo Reef, Wakatobi's species count exceeds it by 200, making it a global benchmark for richness.