4. Puerto Rico
An unincorporated territory of the United States, Puerto Rico is an archipelago that includes the main island and a number of smaller islands off its shore. Puerto Rico is surrounded by a continental shelf on three sides, offering an abundance of coral reefs, caves, sea walls and trenches for divers of all levels to explore. Divers recommend Candyland, a must-see reef, which offers a kaleidoscope of gigantic sea fans, lettuce corals and sponges. Dare to swim with nurse sharks and barracudas at Cayo Lobito.
