Trading posts, colonies
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Other great civilizations
Change of the Earth axis
It is the Greeks who do have given us the best description until now and kept the Atlantis story alive. Many of there stories originate in the Archives of Egypt and Babylon. In both cases it was the priests who did know where to find it and translate. Berossus priest in Babylon able to read write and speak Greek. There is Herodotus a well-known Greek reporter. Hieronymus, Egyptian of origin but able to read and speak in different languages and Josefus a Jew.
At that Time the Mediterranean was less than half the size it is today.
According to Critias, 9,000 years before his lifetime a war took place between those outside the Pillars of Hercules (generally thought to be the Strait of Gibraltar) and those who dwelt within them. The Atlanteans had conquered parts of Africa and Libya, within the columns of Heracles Egypt and part of the European continent as far as Tyrrhenian, and subjected its people to slavery. The Athenians led an alliance of resistors against the Atlantis Empire and as the alliance disintegrated, prevailed alone against the empire, liberating the occupied lands. But at a later time there occurred portentous earthquakes and floods, and one grievous day and night befell them, when the whole body of your warriors was swallowed up by the earth, and the island of Atlantis in like manner was swallowed up by the sea and vanished. Critias claims that his accounts of ancient Athens and Atlantis stem from a visit to Egypt by the Athenian lawgiver Solon in the 6th century BC. In Egypt, Solon met a priest of Sais, who translated the history of ancient Athens and Atlantis, recorded on papyri in Egyptian hieroglyphs, into Greek. According to Plutarch, Solon met with "Psenophis of Heliopolis, and Sonchis the Saite, the most learned of all the priests" (Life of Solon).
For it is related in our records how once upon a time your State stayed the course of a mighty host, which, starting from a distant point in the Atlantic ocean, was insolently advancing to attack the whole of Europe, and Asia to boot. For the ocean there was at that time navigable; for in front of the mouth which you Greeks call, as you say, 'the pillars of Heracles,' there lay an island which was larger than Libya and Asia together; and it was possible for the travelers of that time to cross from it to the other islands, and from the islands to the whole of the continent over against them which encompasses that veritable ocean
Now in this island of Atlantis there existed a confederation of kings, of great and marvelous power, which held sway over the entire island, and over many other islands also and parts of the continent.
The people of Atlantaís built bridges northward from the mountain, making a route to the rest of the island. They dug a great canal to the sea, and alongside the bridges carved tunnels into the rings of rock so that ships could pass into the city around the mountain; they carved docks from the rock walls of the moats. Every passage to the city was guarded by gates and towers, and a wall surrounded each of the city's rings. The walls were constructed of red, white and black rock and were covered with brass, tin and orichalcum.