BOLINA was either a Haliad or Naiad nymphe of the town of Bolina in Akhaia, southern Greece. If the latter, she probably presided over the town springs which flowed into the sea. Bolina was once a mortal maiden of the town who, fleeing from the amorous pursuit of the god Apollon, leapt into the sea to escape him. He then transformed her into an immortal Nymphe.

Pausanias, Description of Greece 7. 23. 4 (trans. Jones) (Greek travelogue C2nd A.D.) :
"Apollon, says a legend fell in love with a maiden called Bolina [who lived at Bolina in Akhaia], who fleeing to the sea here threw herself into it, and by the favour of Apollon became an immortal."

Sources:

• Pausanias, Description of Greece - Greek Travelogue C2nd A.D.