Heron is a tiny Barrier Reef coral cay , of only 17 hectares, in the Capricornia Group of islands of Australia's Great Barrier Reef.
The Pandora survivors managed to climb aboard tenders and reach the safety of a sand cay .
How policy trickles down from UNESCO headquarters in Europe to a sand cay on the outer edge of the Great Barrier Reef half a world away is something else entirely.
If you're a non-swimmer, take a tour that brings you to a coral cay rather than the open sea.
Low Isles make the most minimal of archipelagos; just two islands; the one, a small sunny cay of coral sand, and the other, a dark wilderness of mangroves.
Parola Island and the Lawak, Panata and Rizal Reefs are among a group of islands, reefs and cays claimed by the Philippines in the Spratlys.
The Abacos are a group of islands and cays stretching across 30 miles of shallow sparkling water.
You can enjoy brilliant corals, pristine cays , white sandy beaches and endless marine life.
Instead, the uniform azure of the sea was broken only by the colours of the coral cays : turquoise, tourmaline, amethyst and lapis lazuli.
Boobies that nest on the ground, the masked gannet and the brown booby, are also found on remote cays of the Great Barrier Reef.