describe setting of novel

The setting of the novel is in the Atlantic Ocean, America, and the underworld. The book starts out in Italy but quickly moves to the Atlantic Ocean. There it just talks about the blue sea and monsters that they encounter. But then they arrive in America. There they quickly move across the US to accomplish their main goal. But the other half of the story is in the underworld with Percy and Annabeth. There they try to accomplish a similar goal to the others. But their goal is different in a miniture way.