The Underworld also features four other waterways: Acheron, the river of woe; Cocytus, river of wailing; Lethe, river of oblivion; and Phlegethon, river of fire, a great source of natural light.
The Greco-Roman Hades was a dim place of flitting fretful shades still recognizable as Virgil's aneus recognized his father but fugitive as sand And this was their condition for eternity.
But we might recall that the Gorgias also ended with a discussion of the afterlife and the judgment accorded to the virtuous and the vicious in Hades, where the unjust receive a slap in the face for eternity.