Atlantis: The Antedeluvian World by Ignatius Donnelly This book is an attempt to demonstrate several distinct and novel propositions. These are: 1. That there once existed in the Atlantic Ocean, opposite the mouth of the Mediterranean Sea, a large island, which was the remnant of an Atlantic continent, and known to the ancient world as Atlantis. 2. That the description of this island given by Plato is not, as has been long supposed, fable, but veritable history. 3. That Atlantis was the region where man first rose from a state of barbarism to civilization.