Snorkel at Klein Curaçao

Granite-boulder islands in the Andaman Sea with some of Thailand’s clearest water and best coral.

Dazzling turquoise South Pacific lagoon.

Coral dive site of mushroom-shaped formations.

Ras Mohammed’s coral walls and the Thistlegorm wreck, with visibility so clear the reef looks lit from within.

Jordan’s slice of the Red Sea: coral gardens, a sunken tank and the Cedar Pride wreck in warm, calm water.

Vast, remote Pacific lagoon.

Oceanic island off Borneo ranked among the best dive sites on Earth — turtles, barracuda tornadoes, reef sharks.

The planet's richest coral reefs.