California

California is a state in the United States of America.

The Lightning Thief
Percy Jackson, Annabeth Chase and Grover Underwood go to Los Angeles, the entrance to the Underworld to convince Hades to return Zeus’ Master Bolt and Sally Jackson. After escaping the three end up on Santa Monica Beach.

The Titans Curse
Percy, along with Thalia Grace and Zoë Nightshade travel to San Francisco to save Annabeth and Artemis from the Titan strong hold at Mount Othrys.

The Lost Hero
Jason Grace, Piper McLean, Leo Valdez and Gleeson Hedge arrive in San Francisco and climb Mount Diablo to rescue Tristan McLean from the |Gigante Enceladus.

The Son of Neptune
Camp Jupiter is present at the start and conclusion of the book.

The Mark of Athena
Camp Jupiter is the setting of the first few chapters of the book.

The Burning Maze
Apollo, Meg McCaffrey and Grover travel around Southern California for the book. They visit Palm Springs, Malibu, Los Angeles, and Santa Barbara.