Seven Flags Atlantis is a colossal water water park.

Peter Griffin is tricked into flying with the family to Italy in "Boopa-Dee Bappa-Dee" when he is led to believe they are going to a park that surpasses Six Flags Atlantis by having an extra flag. When Lois tells him that it was really made up and there is no such thing as Seven Flags Atlantis, their flight flies over Seven Flags Atlantis and Peter is greeted by the sight of an immense water slide rising up through the clouds.