Oenus also called Kelefína, the modern Oinoús, rises in the watershed of Mt. Parnon

Parnon

Parnon or Parnonas or Malevo is a mountain range, or massif, on the east of the Laconian plain and the Evrotas valley. It is visible from Athens above the top of the Argive mountains. The western part is in the Laconia prefecture and the northeastern part is in the Arcadia prefecture. The Parnon...

, and, after flowing in a general southwesterly direction, falls into the Eurotas

Eurotas

In Greek mythology, Eurotas was a son of Myles and grandson of Lelex, eponymous ancestor of the Leleges, the pre-Greek people residing, in the myth, in the Eurotas Valley. He had no male heir, but he did have a daughter, Sparta. Eurotas bequeathed the kingdom to her husband, Lacedaemon, the son of...

, at the distance of little more than a mile from Sparta

Sparta

Sparta or Lacedaemon, was a prominent city-state in ancient Greece, situated on the banks of the River Eurotas in Laconia, in south-eastern Peloponnese. It emerged as a political entity around the 10th century BC, when the invading Dorians subjugated the local, non-Dorian population. From c...

. (Polyb.

Polybius

Polybius , Greek ) was a Greek historian of the Hellenistic Period noted for his work, The Histories, which covered the period of 220–146 BC in detail. The work describes in part the rise of the Roman Republic and its gradual domination over Greece...

 ii. 65, 66; Liv.

Livy

Titus Livius — known as Livy in English — was a Roman historian who wrote a monumental history of Rome and the Roman people. Ab Urbe Condita Libri, "Chapters from the Foundation of the City," covering the period from the earliest legends of Rome well before the traditional foundation in 753 BC...

 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.)