It is a city shrouded in myth, swallowed by the Mediterranean Sea and buried in sand and mud for more than 1200 years. For centuries it was thought to be a . In this edition of World History, we are going to present you the facts and information about the lost city of Heracleion i.e., find out all about the history of . Heracleion, also known as Thonis, was an ancient Egyptian city near Alexandria whose ruins are located in Abu Qir Bay, submerged in 150 feet of water.