Northern Territory borders

[1] (26 January 1788 – Map) On 16 July 1825, the western boundary of New South Wales was relocated to the line of 129° east to take in the new settlement at Melville Island.

The name of the Swan River Colony was changed to Western Australia in 1832 (6 February 1832 – Map).

In 1847 the colony of North Australia was revoked and reincorporated into New South Wales.

In 1851 South Australia's eastern border changed again when the colony of Victoria was proclaimed (1 July 1851 – Map).

In 1859 The colony of Queensland is proclaimed by Letters Patent, with its western border set at 141° east[10] (6 June 1859 – Map).

In 1862 Queensland's western border north of 26° south) was moved to 139° east (1862).

In 1911 the Northern Territory was split off from South Australia to be administered by the Commonwealth.

Marking the Northern Territory borders on the ground has a fascinating history.

The actual West Australian border with the Northern Territory and South Australia, which has been marked on the ground, is not as straight as it looks, with the WA/NT and WA/SA borders being displaced by approximately 127 m due to early survey errors within the limits of technology available in the 1920s.

The 127-metre section that runs east–west along the 26° south is part of the border between Western Australia and the Northern Territory.