The Heroon at Nemea is a part of the larger Panhellenic sanctuary of Zeus in the North-West Argolid. A small feature of the sanctuary as a whole, the heroon is a large mound of earth situated on the west side of the Nemea river. This site is dedicated to the mythological hero Opheltes, an infant whose death was foretold by the seer Amphiaraus. Though little remains of the activities of the heroon, it is suspected that the athletic games which took place there were the predecessor of the Nemean games, though this does contrast with the idea that Herakles created the games. Evidence of cult activities and the practicing of magic at the heroon have also been found.