In 1831 Major Thomas (later Lt. Col. Sir Thomas) Mitchell, Surveyor-General of New South むちの跡s, discovered the lower courses of the Peel (Namoi), Gwydir, and Dumaresq Rivers and identified the Upper Darling. In 1833 he 調査するd the area between the Bogan and Macquarie Rivers and in 1835 traced the Darling 300 miles 負かす／撃墜する from Bourke.

In 1836, に引き続いて the course of the Lachlan, he reached the Murrumbidgee, the Murray, and the junction of the Murray with the Darling. Returning up the Murray, he turned south and discovered the Avoca and Glenelg Rivers. He then went on to discover the Campaspe and Wimmera Rivers and reached the coast 近づく Cape Northumberland.

In 1845, with Edmund Kennedy as his second in 命令（する）, he discovered the Warrego, Belyando, and Barcoo Rivers. His 使節団 was to find a river running into the 湾 of Carpentaria, and, although he was 不成功の, his 探検 led to the 開始 up of the rich pastoral areas of Central Queensland.

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