San Juan is the capital and most populous municipality in the Commonwealth of Puerto Rico, an unincorporated territory of the United States.
Reyna Avila Ramírez-Arellano, Coach Hedge, and Nico di Angelo shadow travel to San Juan with the Athena Parthenos. Reyna is soon kidnapped by Thalia Grace and her Hunters and taken to the Amazon's highly defended secret base. Reyna soon realizes she was captured in order for her to be used as a bait to lure Orion into a trap. Although the plan succeeds, the Amazons and Hunters had underestimated the giant's power. He breached their base, which resulted in the loss of many lives. Reyna and her sister Hylla, Queen of the Amazons, manage to escape and Reyna finds herself in the house she had lived in for most of her childhood.
|Magical Locations:||Aeolia | Camp Half-Blood | Camp Jupiter | Cave of Trophonius | C.C.'s Spa and Resort | Daedalus' Workshop | Lotus Hotel and Casino | Mount Othrys | Ogygia | Olympus | Pan's Cave | Sea of Monsters | The Labyrinth | Tartarus | Underworld | Waystation|
|Cities, States, and Towns:||Alaska | Bar Harbor | Bologna | Chicago | Detroit | Gila Claw | Indianapolis | Jamestown | Montauk | New Mexico | New York City | Palm Springs | Quebec | San Francisco | Dalmatia | Vancouver | Venice | Westport|
|Other Locations:||Apennine Mountains | Aunty Em's Gnome Emporium | Carlsbad Caverns | Crusty's Water Bed Palace | Empire State Building | Gateway Arch | Grand Canyon | Greece | Hoover Dam | Italy | Junkyard of the Gods | Mount Diablo | Mount Etna | Mount Saint Helens | Mount Tamalpais | Pikes Peak | Polyphemus' Island | ROFL | Rome | Triple G Ranch | U.S.A. | Waterland|