San Juan is the capital and most populous municipality in the Commonwealth of Puerto Rico, an unincorporated territory of the United States.

The Heroes of Olympus

The Blood of Olympus

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.

Locations (CHB)
Magical Locations: Olympus | Camp Half-Blood | Camp Jupiter | Aeolia | C.C.'s Spa and Resort | Daedalus' Workshop | Lotus Hotel and Casino | Mount Othrys | Ogygia | Pan's Cave | Sea of Monsters | The Labyrinth | Tartarus
Cities, States, and Towns: Alaska | Bar Harbor | Chicago | Detroit | Gila Claw | Jamestown | Long Island | Manhattan | New York City | Quebec | San Francisco | Vancouver | Westport
Other Locations: Apennine Mountains | Aunty Em's Gnome Emporium | Crusty's Water Bed Palace | Empire State Building | Gateway Arch | Grand Canyon | Greece | Hoover Dam | Junkyard of the Gods | Mount Saint Helens | Polyphemus' Island | ROFL | Rome | Triple G Ranch | Waterland | Mount Etna | Mount Diablo | Mount Tamalpais | Pikes Peak