Haddon Corner
| Haddon Corner | |
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 Location of Haddon Corner in Queensland
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| Location | South-West Queensland, on the border corner with South Australia, Tanbar, Shire of Barcoo, Queensland, Australia |
| Coordinates | 26°S 141°E / 26°S 141°ECoordinates: 26°S 141°E / 26°S 141°E |
| Design period | 1870s - 1890s (late 19th century) |
| Official name: Haddon Corner | |
| Type | state heritage |
| Designated | 9 November 2012 |
| Reference no. | 602807 |
Haddon Corner is a heritage-listed site in Tanbar, Shire of Barcoo, Queensland, Australia. It is in outback Channel Country at South-West Queensland, on the border corner with South Australia. It was added to the Queensland Heritage Register on 9 November 2012.
It was first surveyed by Augustus Poeppel in 1880. Haddon Corner lies at the intersection of the 26th parallel south circle of latitude and the 141st meridian.
Haddon Corner, marked in 1880 during the official survey of the western section of the border between Queensland and South Australia undertaken in 1879-1880, defines the north-eastern corner between Queensland and South Australia. Its marking was a surveying feat of its time.
Letters patent issued by Queen Victoria in June 1859 separated the new Colony of Queensland from New South Wales (NSW). They described Queensland's border as the watershed from Point Danger (28°8"S) west to the Dumaresq River; the Dumaresq, Macintyre and Barwon Rivers to latitude 29 degrees South; and along latitude 29 degrees South to the 141st meridian of East longitude, which was the eastern boundary of South Australia.
Although legal opinion advised that the 141st meridian was the western boundary of Queensland, Surveyor-General Augustus Charles Gregory believed otherwise. In a memorandum of 28 September 1860 he wrote "the western boundary ... appears to be the 141st meridian; but it is probable that it was not described in the Letters Patent erecting the Colony, with greater distinctness, expressly with a view to a future adjustment, when more certain information should have been collected as to the natural features of the country... It is now submitted that the 141st meridian passes through the tract of country known as the "Plains of Promise" and that the Eastern shore [of the Gulf of Carpentaria] possesses no harbours. It would therefore be desirable to adopt the 138th meridian as the boundary; as that line would pass through a barren tract of country, and bring "Investigator's Road' [an anchorage] within the limits of Queensland.'
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