On three estuarine branches of the now extinct Canopic arm of the Nile River, three branches now submerged, five to fifteen kilometers east of Alexandria, Egypt, in Aboukir Bay of the Mediterranean Sea, are the ruins of three bronze age cities, Herakleion, Menouthis, and Canopus, mostly under several meters of silt now, but cities, as confirmed by divers and sonar scans, to have been huge megalithic complexes of temples, canals, paved streets, statues, and stone-work plazas, which succumbed to the sea with the end of the Ice Age.
Mainline archaeologist Frank Goddio has carried out the most extensive investigation of these anciently submerged sites, and with maps, photos, and videos, you can see the grandeur of these three ice age cities which were the western gateways to Egypt for the mediterranean world circa 2000 B.C., and on the eastern shore of the Mediterranean, are the submerged ice age canaanite port cities of Atlit, Old Sidon, Yarmuta, with more on up the coast of Lebanon, all having gone under when the Ice Age ended, when sea level rose about 100 meters, which consumed about 25 million square miles of land in total worldwide.
When Alexander the Great marched to the coast of Egypt where the Canopic branch of the Nile still flowed into the Mediterranean (by that time into Aboukir Bay, over a thousand years after Canopus, Menouthis, and Herakleion, had succumbed to the sea), the only settlement at the site of what would become Alexandria was the tiny fishing village of Rhakotis, with Naukratis, fifty miles inland on the Canopic branch, having been the commercial shipping gateway to Egypt from the Mediterranean at that time, so Alexander built his great port city on the shore of the Mediterranean, 20 kilometers from where the then still extant Canopic branch flowed into Aboukir Bay, indicating that the three now submerged cites were indeed not there when Alexander lived.
But mainstream scientists say that the now submerged cities were there when Alexander arrived, which is plainly silly, as there would have been no need to build Alexandria with those three cities already there, and surely Alexander would have gone to those cities, not tiny Rhakotis instead, if the three now-submerged cities were still thriving ports, as mainstream academics, such as Frank Goddio, still insist.
And see http://genesisveracityfoundation.com.