
Greek Mythology
The Peneus River is a river in Elis that appears in the labor in which Heracles cleans the stables of Augeas. Its importance lies chiefly in that episode: its waters are diverted to wash away years of accumulated filth, enabling the hero to complete the task in a single day.
In the relevant story, the Peneus River lies in Elis, near the stables of Augeas. It is mentioned together with the Alpheus River, and both rivers are used by Heracles as sources of water for cleaning the stables.
In the story of Heracles cleaning the stables of Augeas, the Peneus River is not an independent divine actor or the main setting, but a geographical element that makes the labor possible. After observing the terrain and watercourses around the stables, Heracles diverts the waters of the Peneus and the Alpheus through the cattle sheds, using their force to carry out the cleaning.
The story states only that the Peneus River is in Elis and near the stables of Augeas. Its narrative role parallels that of the Alpheus River: together they form the nearby river system that can be channeled into the stables.
"The Augean Stables and the Stymphalian Birds" mentions this place: Heracles uses the waters of the Peneus and Alpheus rivers to wash out the stables of Augeas, which had not been cleaned for many years.