26th parallel south in the context of "Northern Territory of Australia"

The Northern Territory (abbreviated as NT; known formally as the Northern Territory of Australia and informally as the Territory) is an Australian internal territory in the central and central-northern regions of Australia. The Northern Territory shares its 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 Northern Territory looks out to the Timor Sea, the Arafura Sea, and the Gulf of Carpentaria, including Western New Guinea and various other islands of the Indonesian archipelago.

The NT covers 1,347,791 square kilometres (520,385 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 260,400 as of March 2025 – fewer than half the population of Tasmania. The largest population centre is the capital city of Darwin, having about 52.6% of the Territory's population. The largest inland settlement is Alice Springs with a population of about 25,000 people.

The South Australia Act 1834 (4 & 5 Will. 4. c. 95), or Foundation Act 1834 and also known as the South Australian Colonization Act, was an Act of the Parliament of the United Kingdom which provided for the settlement of a province or multiple provinces on the lands between 132 degrees east and 141 degrees of east longitude, and between the Southern Ocean, and 26 degrees south latitude, including the islands adjacent to the coastline.

It also set up a London-based Board of the South Australian Colonization Commission allowing for three or more appointed commissioners (board members), known as the Colonization Commissioners for South Australia or, later, Colonisation Commissioners, to oversee the sale and leasing of land in South Australia to British subjects. This Board was to be represented in the new colony by a Resident Commissioner, Surveyor-General, an Emigration Agent and various other colonial officers.

Queensland is the north-eastern state of Australia and has land borders with three other Australian states and territories: New South Wales (to the south), South Australia (to the south-west) and Northern Territory (to the west). To the north of Queensland is the Torres Strait separating the Australian mainland from Papua New Guinea. To the east of Queensland is the Coral Sea, part of the Pacific Ocean. There are many islands off the Queensland coast which form part of the state of Queensland.

The far western boundary with the Northern Territory is aligned along the 138th meridian east until Poeppel Corner at the intersection of this meridian and the 26th parallel south. It is here that Queensland borders South Australia. The boundary follows this latitude until it reaches the 141st meridian east at Haddon Corner where the border turns south reaching Cameron Corner on the 29th parallel south, the most western part of the border with New South Wales. The border follows this latitude towards the coast at about the 154th meridian east before following the courses of a number of rivers, then across a number of mountain ranges until it reaches Point Danger. From west to east, these rivers are the Barwon River, Macintyre River and Dumaresq River.