The Territory of Christmas Island, is an Australian external territory comprising the island of the same name. It is located in the Indian Ocean, around south of Java and Sumatra and about northwest of the closest point on the Australian mainland. It lies northwest of Perth and south of Singapore. It has an area of .
Christmas Island had a population of 1,692 residents , the majority living in settlements on the northern edge of the island. The main settlement is Flying Fish Cove. Historically, Asian Australians of Chinese, Malay, and Indian descent formed the majority of the population. Today, around two-thirds of the island's population is estimated to have Straits Chinese origin (though just 22.2% of the population declared a Chinese ancestry in 2021), with significant numbers of Malays and European Australians and smaller numbers of Straits Indians and Eurasians. Several languages are in use, including English, Malay, and various Chinese dialects. Islam and Buddhism are major religions on the island. The religion question in the Australian census is optional and 28% of the population do not declare their religious belief, if any.
The first European to sight Christmas Island was Richard Rowe of the Thomas in 1615. Captain William Mynors named it on Christmas Day (25 December) 1643. It was first settled in the late 19th century. Christmas Island's geographic isolation and history of minimal human disturbance has led to a high level of endemism among its flora and fauna, which is of interest to scientists and naturalists. The majority (63 percent) of the island is included in the Christmas Island National Park, which features several areas of primary monsoonal forest. Phosphate, deposited originally as guano, has been mined on the island since 1899.
Christmas Island is situated at the peak of a basalt volcanic seamount which arose from the ocean floor in the Eocene era about 60 million years ago, when the ocean eroded cliffs from uplifts, forming steep terraces and cliffs at the central plateau.