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Lakes and Underground Water Most of the major natural lakes of Australia contain salt water. The great network of salt lakes in South Australia—Lake Eyre, Lake Torrens, Lake Frome, and Lake Gairdner—is the remains of a vast inland sea that once extended south from the Gulf of Carpentaria. During the dry season many of the salt lakes become salt-encrusted swamp beds or clay pans. Lake Argyle, created by the construction of the Ord River Scheme, is Australia's largest artificially created freshwater lake.Great areas of the interior, which otherwise would be useless for agriculture, contain water reserves beneath the surface of the land. These artesian water reserves, usually found at a great depth, are tapped by drilling to provide water essential for livestock. Artesian water reserves underlie about 2.5 million sq km (about 1 million sq mi) of Australia. The Great Artesian Basin, extending from the Gulf of Carpentaria into the northern part of New South Wales, includes more than 1.7 million sq km (700,000 sq mi). Other artesian basins are in the northwest, southeast, and along the Great Australian Bight.