Camp Half-Blood is a Greek demigod training facility located on the Long Island Sound, directed by Dionysus, who the campers call "Mr. D," and Chiron, a Centaur who is the activities coordinator. It is also the Greekcounterpart of Camp Jupiter, a Roman camp in San Francisco, California.
The camp has magical borders, which are enforced by the Golden Fleece, found by the satyr Grover Underwood, the Cyclops Tyson, and demigods Percy Jackson, Clarisse La Rue, and Annabeth Chase. Stolen from Polyphemus' island, it was placed on Thalia's pine tree, ensuring that no monsters could get into camp. The Fleece stays on the tree, guarded by the dragon Peleus, it's magical powers protecting the camp.
The camp is described as being the only safe place for half-bloods, although in The Heroes of Olympus series it is revealed that there is a similar camp for Roman demigods – Camp Jupiter, located in San Francisco.
The half-bloods live in cabins (one for each Olympian; later, many more cabins were added later for minor gods and goddesses on after Percy's request in The Last Olympian), and eat at the dining pavilion. There is also an archery field, a sword fighting arena, a climbing wall with lava for training, an amphitheater, stables, an armory, and the Big House.
The camp's cover name is Delphi Strawberry Service, a reference to the name of the Oracle of Delphi.
(Sorced from the Wikia database in Xyzzy Library)