mythological places: rivers in underworld - acheron, kokytos, lethe, phlegethon, styx.
In ancient Greek mythology, Acheron was known as the river of woe, and was one of the five rivers of the Greek underworld. In the Homeric poems the Acheron was described as a river of Hades, into which Cocytus and Phlegethon both flowed.
Cocytus or Kokytos, meaning “the river of wailing” (from the Greek Κωκυτός, “lamentation”), is a river in the underworld in Greek mythology. Cocytus flows into the river Acheron, across which is the underworld, the mythological abode of the dead.
The shades of the dead were required to drink the waters of the Lethe in order to forget their earthly life. In the Aeneid, Virgil writes that it is only when the dead have had their memories erased by the Lethe that they may be reincarnated
Plato describes Plegethon as “a stream of fire, which coils round the earth and flows into the depths of Tartarus. It was parallel to the river Styx. It is said that the goddess Styx was in love with Phlegethon, but she was consumed by his flames and sent to Hades. Eventually when Hades allowed her river to flow through, they reunited.
The gods were bound by the Styx and swore oaths on it. The reason for this is during the Titan war, Styx, the goddess of the river Styx, sided with Zeus. After the war, Zeus promised every oath be sworn upon her. Zeus swore to give Semele whatever she wanted and was then obliged to follow through when he realized to his horror that her request would lead to her death. Helios similarly promised his son Phaëton whatever he desired, also resulting in the boy’s death. According to some versions, Styx had miraculous powers and could make someone invulnerable. According to one tradition, Achilles was dipped in it in his childhood, acquiring invulnerability, with exception of his heel, by which his mother held him. This is the source of the expression Achilles’ heel, a metaphor for a vulnerable spot.
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