Board Thread:The Heroes of Olympus/@comment-33754470-20161013144956/@comment-25155763-20170609001827

Well Atlantis is a cohesion of a bunch of different myths revolving aroun sunken palaces and underwater kingdoms, one of those parts being Poseidon's palace.

So in as sense, Atlantis is the mortal world's concept of Poseidon's Underwater Palace, the same way The Bermuda Triangle is really The Sea of Monsters.