The Great Artesian Basin is one of the largest underground freshwater reservoirs in the world, located in Australia. It spans over 1.7 million square kilometers, covering parts of Queensland, New South Wales, South Australia, and the Northern Territory. The basin is crucial for supplying water to rural communities, agriculture, and livestock in arid regions. This natural aquifer is formed by layers of porous rock that hold water, which is replenished by rainfall in the surrounding areas. The Great Artesian Basin supports diverse ecosystems and is vital for sustaining life in the harsh Australian landscape.