Passage 6.21.5
τούτου δὲ οὐ πόρρω ἱερὸν Διονύσου Λευκυανίτου πεποίηται, καὶ ποταμὸς παρέξεισι ταύτῃ Λευκυανίας· ἐκδίδωσι μὲν οὖν καὶ οὗτος ἐς τὸν Ἀλφειόν, κάτεισι δὲ ἐκ Φολόης τοῦ ὄρους. διαβήσῃ τε δὴ τὸ ἀπὸ τούτου τὸν Ἀλφειὸν καὶ ἐντὸς γῆς ἔσῃ τῆς Πισαίας.
Not far from this is built the sanctuary of Dionysus Leucyanites, and by it flows the river Leucyanias. This river also joins the Alpheius, coming down from Mount Pholoe. Once you cross here the Alpheius, you will come into the land of Pisa.