So, we are about to learn more about this festive island: the Christmas Island. The Territory of Christmas Island is an Australian external territory comprising the island of the same name. The majority (63%) of the island is included in the Christmas Island National Park. From the outbreak of the South-East Asian theatre of World War II in December 1941, Christmas Island was a target for Japanese occupation. In early 1986, the Christmas Island Assembly held a design competition for an island flag.