Strabo Geography 9.3.16

[16] Parapotamii is a settlement on the Cephissus River near Phanoteus and Chaeroneia and Elateia. Theopompus says that this place is distant from Chaeroneia about forty stadia and marks the boundary of the territories of the Ambryseans, the Panopeans and the Daulians; and that it lies on a moderately high hill at the pass which leads from Boeotia into Phocis, between the mountains Parnassus and Hadylius, between which is left a tract of about five stadia divided by the Cephissus River, which affords a narrow pass on each side. The river, he continues, has its beginnings in the Phocian city Lilaea (just as Homer says, ¹ ), and empties into Lake Copais; and the mountain Hadylius extends over a distance of sixty stadia as far as the mountain Acontius, ² where Orchomenus is situated. And Hesiod, too, describes at considerable length the river and the course of its flow, saying that it flows through the whole of Phocis in a winding and serpentine course; ³ The narrow pass in the neighborhood of Parapotamii, or Parapotamia (for the name is spelled both ways), was an object of contention in the Phocian war, since the enemy had here their only entrance into Phocis. There are, besides the Phocian Cephissus, the one at Athens, the one in Salamis, a fourth and a fifth in Sicyon and in Scyros, and a sixth in Argos, which has its sources in Mt. Lyrceius; and at Apollonia near Epidamnus there is a fountain near the gymnasium which is called Cephissus.