The most famous nekromanteio (oracle of the dead) of the ancient Greek world lies near the shores of the Acherousian Lake, where Acheron and Kokkytos, the rivers of Hades, meet. Ancient literary sources describe the Acherousian Lake as the place where the dead began there descent to Hades, and associated Ephyra, the city located further north, with the ancient cult of the god of death. The nekromanteion attracted people wishing to meet the souls of the dead, as these were able to foresee the future after having left their body. The remains date back to the Hellenistic period. The sanctuary operated in this form continuously for approximately two centuries.