LANGIA was the Naiad Nymph of the fresh-water springs of the town of Nemea in Argolis (southern Greece).
She was probably the same as the Naias Nemea, and was perhaps identified with Nemea or Ersa (of the Dew), the daughter of Zeus and Selene.
Perhaps a daughter of the River ASOPOS
Statius, Thebaid 4. 716 ff (trans. Mozley) (Roman epic C1st A.D.) :
"[When Dionysos scorched Argos with drought and dried up all the springs, the Nemean spring:] Langia alone--and she by the god's command--preserves her waters in the silence of a secret shade. Not yet had slaughtered Archemorus [Opheltes whose death by her waters marked the founding of the Nemean Games] brought her sorrowful renown, no fame had come to the goddess; nevertheless, in far seclusion, she maintains her spring and grove. Great glory awaits the Nympha, when the toiling contests of Achaean princes and the four-yearly festival of woe [the Nemean Games] shall do honour to sad Hypsipyle and holy Opheltes.
[The parched Argive army was then forced to stop at Nemea in search of water]."
- Statius, Thebaid - Latin Epic C1st AD