DEINO (or Dino) was the Naiad Nymph of the springs at the source of the River Sperkheios in Malis, central Greece. Her husband was the river-god.
She was probably one of the Okeanides, like many a river-god wife.
Antoninus Liberalis, Metamorphoses 22 (trans. Celoria) (Greek mythographer C2nd A.D.) :
"[Kerambos, Cerambus said that] the Nymphai [of Mount Othrys], were not descended from Zeus, but that Deino had given birth to them, with the River Sperkheios (Spercheus) was the father. He also said that Poseidon, for lust of one of them, Diopatre, had made her sisters put down roots and turned them into poplars until, satiated with his desires, he had returned them to their original shapes."
- Antoninus Liberalis, Metamorphoses - Greek Mythography C2nd AD