1. Red Sea, Egypt

2. Palau, Micronesia

3. Hin Daeng & Hin Mouang, Thailand

4. Great Barrier Reef, Australia

5. Moorea, French Polynesia

6. Dominica

7. East Timor

8. Ambergris Bay, Belize

9. Capetown, South Africa

10. Similian Islands, Thailand


For more details, visit this website:
http://www.iexplore.com/activity-guides/scuba-diving/top-10-overall