ANTHRAKIA (or Anthracia) was a nymph of Mount Lykaios, one of the Arkadian nurses of the god Zeus. Her attribute was a burning-torch suggests she was an Oreias or Dryas tree-nymph rather than a Naiad.

Pausanias, Description of Greece 8. 47. 3 (trans. Jones) (Greek travelogue C2nd A.D.) :
"Represented on the altar [of Athene at Tegea in Arkadia] are Rhea and the nymphe Oinoe holding the baby Zeus. On either side are four figures : on one, Glauke, Neda, Theisoa and Anthrakia; on the other Ide, Hagno, Alkinoe and Phrixa."

Pausanias, Description of Greece 8. 31. 4 :
"[At Megalopolis in Arkadia, in the enclosure of Demeter and Persephone :] The table also has a representation of Nymphai, Neda carrying the infant Zeus and another Arkadian Nymphe Anthrakia holding a torch, and Hagno with a water-jar in one hand and a drinking cup in the other; Ankhiroe and Myrtoessa are carrying water-jars and in fact water is pouring down from them."

Sources:

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