Plato describes a large mineral-rich mountain range to the north of the Atlantean plain at the southern edge of which was the ringed canal city of Atlas, also known as the city of Atlantis, it was the capital of the Atlantean empire which Plato said extended inside Gibraltar to Libya and Italy, and outside Gibraltar as well along the Atlantic coast. Many submerged ruins are reported off the coast of southern Spain, some thirty miles south of Cadiz, there probably the submerged ruins of the capital.
Many examiners of the writings about Atlantis have bought into the idea that Atlantis was some huge now missing island submerged way out in the Atlantic, but when you realize that Plato called the geography of Atlantis a nesos, which can mean an island, or a peninsula, in this case clearly the Iberian peninsula, extending both outside and inside Gibraltar, then it becomes clear that the mountains to the north of the Atlantean plain are the Sierra Morena mountains of southern Spain, anciently the richest mining district in the world.
The dimensions of the Atlantean plain, 300 miles by 200 miles in Plato’s story, nicely fit the size of the plain to the south of the Sierra Morena mountains, and the Rio Tinto river flowing down across the plain was a major mineral export waterway in ancient times, then known as the Iber river, with its megalithic stoneworks at Niebla bearing testimony to its mineral exporting purpose.
The Iber river was named after Eber of the Table of Nations in the Bible, so the Guadalquiver river just to the east, anciently known as the Tarsis river, named after Tarshish a great grandson of Noah, is no surprise, with Atlas having been a son of Sidon, who was worshipped as Posidon, son of Canaan, all rendered more than plausible by the ancient mapping method explained here http://genesisveracityfoundation.com/earth-measure-geometry, and by the fact that the Ice Age ended actually circa 1500 b.c. at the time of the Exodus.