The world’s largest fringing reef meets the world’s biggest fish at this extraordinary, UNESCO-protected site in Western Australia. Whale sharks cluster on this 300km reef in large numbers from March to July each year, giving the unmissable chance to snorkel with these slow-moving gentle giants. The super-sized creatures are just one part of the reef’s exceptional marine life, which also includes hundreds of fish and coral species, as well as turtles, manta rays and migrating humpbacks.