Raine Island is a vegetated coral cay 32 hectares (79 acres) in total area situated on the outer edges of the Great Barrier Reef off north-eastern Australia.
It lies approximately 620 km (390 mi) north-northwest of Cairns in Queensland, about 120 kilometres (75 mi) east-north-east of Cape Grenville on the Cape York Peninsula.
Raine Island is the largest and most important green sea turtle nesting area in the world, with up to 18,000 females nesting on the small coral sand cay in one season. The turtle population can vary from a figure of less than 1,000 to more than 10,000 and has been found to correlate with the El Niño-Southern Oscillation.
The waters surrounding Raine Island are so active that seeing over 250 turtles during an hour in the water is common. The nesting site has been active on the island for more than 1,000 years, making it the longest known marine turtle rookery anywhere in the world.
According to en.wikipedia