Raine Island Reef, Australia

Photograph by Paul Sutherland

Parrotfish swim over a reef cluster off Raine Island, Australia. Female green turtles travel 1,600 miles (2,575 kilometers) from places like Indonesia and New Caledonia to lay their eggs in spots such as Raine Island. The island, where Aborigines once came in outrigger canoes to gather food, is now off-limits to most visitors to protect the nesting wildlife.