Ancient Phocis was about 1,619 km² (625 mi²) in area, bounded on the west by Ozolian Locris and Doris, on the north by Opuntian Locris, on the east by Boeotia, and on the south by the Gulf of Corinth. The massive ridge of Parnassus (2,459 m/8,068 ft), which traverses the heart of the country, divides it into two distinct portions.