The 2,300-kilometre Great Barrier Reef is the largest coral reef system in the world. Home to diverse marine life of the most vivid colours, experiencing the Reef is a life-changing adventure, whether you do it in luxury or on a budget. See the Reef by scuba, snorkel, glass-bottom boat, jet ski, semi-submersible, sail boat, from the air or even skydive to completely immerse yourself in this wonder of the world.