See a barrier reef

Snorkel or dive at any coral reef

Fringing reef in Western Australia where whale sharks cruise close to shore.

Coastal drive past the Twelve Apostles.

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

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

The planet's richest coral reefs.

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

Clear Caribbean sinkholes and reef right off the shore at Playa Giron.