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The Great Astrolabe Reef is in Fiji and surrounds the fourth largest island, Kadavu Island, which is approximately 65 km in length. Kadavu Island is approximately 100 km south of Viti Levu, the main island of Fiji. The Great Astrolabe Reef is one of the largest barrier reefs in the world and encompasses Kadavu Island, Ono Island and other small islands within a natural protective lagoon. The reef is predominantly located along the southern coast of Kadavu Island and arcs north around Ono Island and further north to Buliya.The reef is a breeding ground for many large billfish species, sharks, tuna, giant trevally, mahi-mahi and snapper, due to it having many channels leading from extremely deep water into shallow lagoons. Wikipedia