The major portion of the Great Artesian Basin in Australia is located in

The Great Artesian Basin (GAB) is Australia's most significant and largest hydrogeological system, covering approximately 1.7 million square kilometres, which represents about 22% of the Australian landmass. It is situated in north-east Australia and underlies parts of Queensland, New South Wales, South Australia, and the Northern Territory [1]. Specifically, the basin covers most of Queensland, where its largest portion is located, as well as the north-western parts of New South Wales, the north-eastern corner of South Australia, and a portion of the Northern Territory. It is a vital resource for pastoral and agricultural industries in these arid regions. While it spans multiple states, the geographical extent is most dominant in Queensland, making it the primary location for the basin's major portion [1].

Sources

1. [1] Certificate Physical and Human Geography , GC Leong (Oxford University press 3rd ed.) > Chapter 26: Agriculture > Soil Conservation and Sound Farming Techniques > p. 246