The Great Artesian Basin in Australia is the largest and deepest aquifer (artesian basin) in the world. It stretches over , which is 22% of the surface area of Australia. This includes most of Queensland, the south-east corner of the Northern Territory, the north-east part of South Australia, and northern New South Wales. The basin is deep in places. It may contain of groundwater. Its temperature ranges from 30°C to 100°C. 