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Sir Thomas Mitchell's first expedition was to investigate rumours of a north-flowing river situated in northern New South Wales: a river that did not exist, but stories of which were spread by an escaped convict. He departed in November 1831. He discovered the lower courses of the Peel (Namoi), Gwydir, and Dumaresq Rivers and identified the Upper Darling.

Mitchell's second journey set out on 7 April 1835 from Boree Station, to follow and map the course of the Darling River which Sturt had discovered some years earlier. Mitchell was determined to prove Sturt wrong in the latter's belief that the river flowed southward into the Murray, as Mitchell believed it must flow northwest. After travelling for several months and following the Darling for almost 500km, Mitchell was forced to admit that Sturt was indeed correct.

On his third journey, Mitchell discovered the rich farming country of western Victoria, which he named "Australia Felix", or "Happy Australia". Prior to reaching this district, Mitchell found significant grazing land south of the Murray River. South of the Murray he discovered the Avoca and Glenelg Rivers. He then went on to discover the Campaspe and Wimmera Rivers and reached the coast near Cape Northumberland. This journey was in 1836.

Mitchell departed on his fourth and final expedition on 16 December 1845, with Edmund Kennedy as his second in command, in search of a great river that he believed must flow from southern Queensland to the Gulf of Carpentaria. He left from Orange in central New South Wales, and headed into what is now western Queensland. Mitchell discovered and named the Balonne, Warrego, Culgoa, Barcoo and Belyando rivers, which mostly flowed south-west into the Darling.

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15y ago

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