Olympia Greece was the site of the ancient Olympic Games, which were celebrated every four years by the Greeks. Olympia was situated in a valley in Elis, in western Peloponnisos (Peloponnesus), through which runs the Alpheus River. It was not a town, but only a sanctuary with buildings associated with games and the worship of the gods. Olympia was a national shrine of the Greeks and contained many treasures of Greek art, such as temples, monuments, altars, theaters, statues, and votive offerings of brass and marble. The Altis, or sacred precinct, enclosed a level space about 200 m (about 660 ft) long by nearly 177 m (nearly 580 ft) broad. In this were the chief centers of religious worship, the votive buildings, and buildings associated with the administration of the games.