1. Belize Barrier Reef - Belize
Best coral reefs in the world, such as Belize Barrier Reef, are filled with rare and threatened marine species.
The UNESCO World Heritage Site is filled with mangroves, cays, estuaries, atolls, bays, and coastal lagoons. It is also filled with over 500 species of fishes and 106 hard and soft coral species.
One of the top scuba diving destinations, it is the longest continuous barrier reef spanning over 298 km of coastline. Swimming, snorkeling, fishing, diving, and sailing are some popular water activities here.