THE NYMPHAI ORTYGIAI were Naiad Nymphs of the springs of Syrakousa (Syracuse) in Sicily.
Diodorus Siculus, Library of History 5. 5. 1 (trans. Oldfather) (Greek historian C1st B.C.) :
"Each one of them [the goddesses] received for her portion a territory [in Sicily] . . .
Artemis received from the gods the island of Syrakousa (Syracuse) [off the coast of Sicily] which was named after her, by both the oracles and men Ortygia. On this island likewise these Nymphai, to please Artemis, caused a great fountain to gush forth to which was given the name Arethousa. And not only in ancient times did this fountain contain large fish in great numbers, but also in our own day we find these fish still there, considered to be holy and not to be touched by men."
- Diodorus Siculus, The Library of History - Greek History C1st BC