The Northern Territory officially the Northern Territory of Australiais an Australian territory in the central and central northern regions of Australia. It shares borders with Western Australia to the west (129th meridian east), South Australia to the south (26th parallel south), and Queensland to the east (138th meridian east). To the north, the territory looks out to the Timor Sea, the Arafura Sea and the Gulf of Carpentaria, including Western New Guinea and other Indonesian islands. The NT covers 1,349,129 square kilometres (520,902 sq mi), making it the third-largest Australian federal division, and the 11th-largest country subdivision in the world. It is sparsely populated, with a population of only 245,800, making it the least-populous of Australia's six states and two territories, with fewer than half as many people as Tasmania.
The archaeological history of the Northern Territory begins over 40,000 years ago when Indigenous Australians settled the region. Makassan traders began trading with the indigenous people of the Northern Territory for trepang from at least the 18th century onwards. The coast of the territory was first seen by Europeans in the 17th century. The British were the first Europeans to attempt to settle the coastal regions. After three failed attempts to establish a settlement (1824–28, 1838–49, and 1864–66), success was achieved in 1869 with the establishment of a settlement at Port Darwin. Today the economy is based on tourism, especially Kakadu National Park in the Top End and the Uluṟu-Kata Tjuṯa National Park (Ayers Rock) in central Australia, and mining.
The capital and largest city is Darwin. The population is concentrated in coastal regions and along the Stuart Highway. The other major settlements are (in order of size) Palmerston, Alice Springs, Katherine, Nhulunbuy and Tennant Creek. Residents of the Northern Territory are often known simply as "Territorians" and fully as "Northern Territorians", or more informally as "Top Enders" and "Centralians".