Original: In Plato 's account , Atlantis was a naval power lying '' in front of the Pillars of Hercules '' that conquered many parts of Western Europe and Africa 9,000 years before the time of Solon , or approximately 9600 BC .
Simplified: Atlantis is a name for a large island or small continent that might have been in the Atlantic Ocean a long time ago , but sank into the sea and disappeared .