The border of Western Australia meets the Northern Territory border and South Australian border at the 26th parallel south, at what is known as Surveyor Generals Corner.
In 1788, Governor Phillip claimed the continent of Australia only as far west as the 135th meridian east longitude (135° east) in accordance with his commission.
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South Australia became a colony in 1836 and until 1846 would be surrounded on land by New South Wales (NSW), with South Australia extending west to the 132° east longitude.
All of these boundaries meet at a single point, which is the easternmost point of the 127 metre section of the Western Australian border with the Northern Territory border which runs east-west along the 26th parallel south latitude to meet the western boundary of the South Australian border.
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