The Egyptian city of Heracleion is under the water of what river's delta?
Submerged four miles off the coast of Alexandria, Egypt, is the ancient lost city of Heracleion. No one is sure how it ended up flooded by the Mediterranean Sea, but Heracleion has been hiding for at least 1,000 years beneath Egypt's coastal waters, near the mouth of the Nile River. Its underwater ruins include 64 ships, 700 anchors, massive statues, and a huge temple.
Source: Atlas Obscura