Parnassus, pahr NAS uhs, is a mountain in Phocis in Greece. Its twin peaks rise to more than 8,000 feet (2,400 meters). In ancient times, Parnassus was considered one of the most sacred Greek mountains. It was described as a favorite place of the gods Apollo, Pan, and Dionysus and the goddesses called the Muses. The famous oracle of Delphi was located on its lower slope. Nearby was the Castalian spring. It was supposed to inspire those who drank from it to write poetry.