Raine Island

Raine Island National Park protects Raine Island, a remote coral cay on the outer Great Barrier Reef approximately 620 kilometres north of Cairns, which hosts the world's largest aggregation of nesting green sea turtles. Tens of thousands of green turtles nest on this small island annually, making it one of the most significant sea turtle nesting sites on the planet. The island also hosts Australia's largest aggregation of nesting seabirds, including wedge-tailed shearwaters, red-footed boobies, and frigate birds. The island's extreme remoteness and restricted access have preserved it in outstanding natural condition.

During the October–April nesting season, Raine Island receives up to 60,000 green turtles in a single night, creating one of nature's great spectacles. The island is also a significant rookery for flatback turtles. Seabird colonies include approximately 250,000 wedge-tailed shearwaters and large numbers of boobies and frigate birds. The surrounding reef supports exceptional fish diversity, sharks, and rays. The concentration of marine life around the island reflects the productivity of the outer reef environment.

The island's vegetation is sparse and adapted to the harsh conditions of a remote coral cay. Pisonia trees are the dominant vegetation and serve as critical nesting habitat for boobies and other seabirds. Beach morning glory and beach spinifex stabilise the sand on the beaches. The vegetation has been severely damaged by the sheer volume of turtle activity, with thousands of animals simultaneously digging nests and disturbing the sand. Active revegetation using pisonia seedlings is undertaken to restore the vegetation that provides shade for nesting birds.

Raine Island is a coral cay built up from the skeletal remains of coral and shell on the reef flat of the outer Great Barrier Reef. It is among the most remote accessible landmasses on the reef. The island includes a navigational beacon constructed of beach rock (aeolianite — compacted sand) built by British Admiralty workers in 1844, the oldest surviving European structure in Queensland. The low-lying cay, typically 3–4 metres above sea level, is vulnerable to storm inundation and sea level rise.

Raine Island is in the tropics, with a wet season from November to April and a dry season from May to October. Trade winds prevail in the dry season, while the wet season brings the monsoon from the north-west. Cyclones are a potential threat. The timing of the turtle nesting season overlaps with the wet season, with peak nesting in the wet months. Ocean temperatures are warm year-round, supporting coral growth and turtle incubation temperatures.

The island is within the sea country of the Torres Strait Islander peoples, who have long navigated these waters. The 1844 construction of the navigation beacon by HMS Fly brought European presence to the island. The island has been the subject of scientific interest since the discovery of its turtle nesting significance in the 20th century, and the Raine Island Recovery Project, involving a consortium of partners, has undertaken significant restoration and monitoring work on the island since 2014.

Raine Island has been protected under various mechanisms due to its extraordinary natural values. The national park proclamation formalised its protection within the broader Great Barrier Reef World Heritage Area. The Raine Island Recovery Project, led by BHP, the Queensland government, Google, the Great Barrier Reef Marine Park Authority, and the Reef and Rainforest Research Centre, has been one of Australia's largest and most significant sea turtle conservation initiatives.

Raine Island is not a typical visitor destination due to its extreme remoteness and the critical importance of protecting nesting turtles and birds from disturbance. Liveaboard dive vessels from Cairns and Port Douglas occasionally permit viewing from a distance. Snorkelling and diving the surrounding reef is world-class. The turtle nesting spectacle, observed from the water, is one of nature's most extraordinary events.

Raine Island is accessible only by liveaboard vessel from Cairns or Port Douglas, a journey of approximately 2–3 days. There are no facilities on the island and landing is generally restricted. Commercial dive operators offer trips to the outer reef near Raine Island. Prior permission from Queensland Parks and Wildlife Service is required for any landing. This is a destination for dedicated and experienced reef travellers.

Raine Island's conservation significance is among the highest of any protected area in Australia. The Recovery Project has involved regrading nesting beaches to improve the inclination and reduce turtle deaths from disorientation, revegetating the island, installing fencing and signage, and conducting intensive monitoring. Rising ocean temperatures causing coral bleaching and sea level rise threatening the cay are the greatest long-term challenges. Satellite tracking of nesting females allows monitoring of the population's health and movements between nesting seasons.