Camp Half-Blood:
* Campground: The main setting of the book. A summer camp for demigods, nestled on Long Island, New York, hidden from mortal eyes. It includes a campfire, cabins for different gods, a lake, a training arena, and a mess hall.
* Big House: The home of the camp director, Chiron, and a hub for important meetings.
* Thalia's Tree: A powerful pine tree, a symbol of Thalia Grace's sacrifice, used as a boundary for camp.
* Training Grounds: Demigods train in various skills like archery, sword fighting, and magic.
The Sea of Monsters:
* The Sea: A dangerous body of water, home to monsters and mythical creatures. The "Sea of Monsters" is actually the mythical Strait of Messina, believed to be haunted by Charybdis and Scylla.
* The Island of Polyphemus: A volcanic island, home to the Cyclops Polyphemus.
* The Underworld: A vast and mysterious realm ruled by Hades.
* The River Styx: A river separating the mortal world from the Underworld, guarded by Charon.
* The Labyrinth: A maze built by Daedalus, a dangerous and confusing place.
Other Locations:
* New York City: The demigods travel through the city, facing dangers and trying to stay hidden.
* The Roman Camp Jupiter: A camp for Roman demigods, located in San Francisco, California.
* The Oracle of Delphi: A temple in Greece where demigods can seek prophecy.
Mythological Elements:
* The Golden Fleece: A magical artifact sought after by the demigods.
* The Fury Sisters: Three terrifying goddesses who torment the guilty.
* The Furies: The divine hounds of Hades.
Symbolic Settings:
* Camp Half-Blood: Represents safety and community for the demigods, a place where they can be themselves.
* The Sea of Monsters: Represents the dangers and challenges faced by the demigods.
* The Underworld: Represents death, loss, and the unknown.
These settings are crucial to the story, influencing the characters' actions and adding depth to the narrative. They create a sense of adventure, wonder, and danger, while also reflecting the themes of identity, courage, and responsibility.