Claudian (in iv. Cons. Hon. 480) alludes to the fact without naming the river; perhaps the Alpheus (i. Cons. Stil. 1. i. 185).
__Et Alpheus Geticis angustus acervis
Tardior ad Siculos etiamnum pergit amores.
Yet I should prefer the Peneus, a shallow stream in a wide and deep bed which runs through Elis and falls into the sea below Cyllene. It had been joined with the Alpheus to cleanse the Augean stable. (Cellarius, tom. i. p. 760. Chandler's Travels, p. 286.)