:''This article concerns the Greek river. For other uses, see
Acheron (disambiguation).''

Acheron river near the village of Glyki.
The 'Acheron' is a
river located in the
Epirus region of northwest
Greece. Acheron translates as the "river of woe" and it was believed to be a branch of the underworld river
Styx over which in ancient
Greek mythology Charon ferried the newly dead souls across into
Hades.
The lake called Acherousia and the river still called Acheron with the nearby ruins of the
Necromanteion are found near
Parga on the mainland opposite
Corfu.
Another branch of Acheron was believed to surface at the Acherusian cape (now
Eregli in
Turkey) and was seen by the
Argonauts according to
Apollonius of Rhodes.
Greeks who settled in Italy identified the Acherusian lake into which Acheron flowed with Lake
Avernus.
Plato in his ''Phaedo'' identified Acheron as the second greatest river in the world, excelled only by
Oceanus. He claimed that Acheron flowed in the opposite direction from Oceanus beneath the earth under desert places.
The god of the river, son of
Oceanus and
Tethys fathered
Ascalaphus with
Orphne or Gorgyra.
The word is also occasionally used as a
synecdoche for Hades itself.
Virgil mentions Acheron with the other infernal rivers in his description of the underworld in Book VI of the ''
Aeneid''. In VII, line 312 he gives to Aeneas the famous saying, ''flectere si nequeo superos, Acheronta movebo'': 'If I cannot deflect the will of Heaven, I shall move Hell.'
In
Dante's ''
Inferno'', the Acheron river forms the border of
Hell. Following Greek mythology,
Charon ferries souls across this river to Hell.