Percy Jackson, Annabeth Chase, and Tyson go to the Sea of Monsters, with an area of the Atlantic known to mortals as the Bermuda Triangle, to get the Golden Fleece before the forces of Kronos. Clarisse La Rue goes to the sea as well as she was chosen to go on the quest.
The Argo II travels across the North Atlantic to get to Rome to save Nico di Angelo from the Gigantes twins Otis and Ephialtes. Along the way they are boarded by Chrysaor and his men and encounter a training camp for Merpeople.
- The Atlantic is home to the Mid-Ocean Ridge, the world's longest mountain range.