The Oenus (Ancient Greek: Οἰνοῦς, Greek: Οινούντας - Oinountas, also called Kelefina) is a river in the Peloponnese peninsula, southern Greece. It rises in the watershed of Mt. Parnon, and, after flowing in a general southwesterly direction, falls into the Eurotas, at the distance of little more than a mile from Sparta. (Polyb. ii. 65, 66; Liv. xxxiv. 28.) The principal tributary of the Oenus was the Gorgylus (Greek: Γόργυλος, Polyb. ii. 66), probably the river of Vrestená. (Leake, Peloponnesiaca, p. 347.) The municipal unit Oinountas, part of the municipality Sparta, was named after the river Oenus.

Oenus
Native name	Οινούντας (Greek)
Location
Country	Greece
Physical characteristics
Mouth
• location	Eurotas
• coordinates	37°05′35″N 22°25′36″E / 37.09318°N 22.4266°E / 37.09318; 22.4266
Basin features
Progression	Eurotas→ Ionian Sea