The flag of Christmas Island consists of a green and blue background, split from the top left corner to the bottom right.

In the top right, the golden bosun bird[1] (Phaethon lepturus fulvus, one of six subspecies of the white-tailed tropicbird) appears.

The disc itself was originally only included to offset the green colour of the map, but has become linked to the mining industry.

[1] In 1986, the Christmas Island Assembly announced a competition to design both a flag and a coat of arms for the territory.

The winning submission was created by Tony Couch, a resident of Sydney who had previously worked on Christmas Island.