those of the River Murray; following the great dividing range southerly to the range dividing the waters of Tenterfield Creek from those of the main head of the Dumaresq River; following that range westerly to the Dumaresq River; and following that river (which is locally known as the Severn) downward to its confluence with the Macintyre River; thence following the Macintyre River, which lower down becomes the Barwan, downward to the 29th parallel of south latitude, and following that parallel westerly to the 141st meridian of east longitude, which is the eastern boundary of South Australia, together with all and every the adjacent Islands, their members and appurtenances, in the Pacific Ocean: And do by these presents separate from our said colony of New South Wales and erect the said territory so described into a separate colony to be called the colony of Queensland..." 1862 change to Queensland's western border The western boundary of the colony of Queensland was not clearly described in the Letters Patent of 1859:"...downward to the 29th parallel of south latitude and following that parallel westerly to the 141st meridian of east longitude which is the easterly boundary of South Australia..."Legal opinion given at the time stated that the 141st meridian was the western boundary of the colony. In a memorandum to the Governor of Queensland dated 28 September 1860, the Surveyor General of Queensland, Augustus Charles Gregory, described his views on the division of Northern Australia. This was with reference to the adjustment of the political boundaries. On Queensland's western boundary, he said:"The western boundary of Queensland, as at present defined, 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."He went on to say:"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 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 Road [harbour] within the limits of Queensland."Investigator Road is an anchorage off Sweers Island in the Gulf of Carpentaria at named by Matthew Flinders on 21 November