Styx
The great river that formed the boundary between the world of the living and the realm of the dead. Oaths sworn on the Styx were absolutely binding, even for gods.
The Story of Styx
The River Styx encircled the underworld nine times, forming an impassable barrier between the living and the dead. The ferryman Charon transported the souls of the deceased across its dark waters in exchange for a coin — which is why the Greeks placed an obol in the mouth of the dead.
The Styx held a unique power: oaths sworn upon its waters were absolutely unbreakable. Even the gods were bound by such vows, and any deity who swore falsely on the Styx was punished with nine years of exile from Olympus. Zeus himself used the Styx to enforce divine promises.
The river was also famous for its role in the story of Achilles. His mother Thetis dipped the infant Achilles in the Styx to make him invulnerable. The magical waters rendered his body impervious to weapons — everywhere except the heel by which she held him, creating his fatal weakness.
Parents
Oceanus and Tethys
Symbols
Fun Fact
The word "stygian" means extremely dark, gloomy, or hellish — from the River Styx.
Words We Inherited
English words and phrases that trace back to this myth. See our full guide to English words from Greek mythology.
Explore Further
Styx
🏛 placeRiver of unbreakable oaths
The Styx was the most sacred river of the underworld — the river by which the gods swore their most binding oaths, from which no vow could be broken.
Acheron River
🏛 placeUnderworld geography
The river of woe in the Greek underworld across which the dead were ferried by Charon
Acheron
🏛 placeRiver of Woe in the underworld
The Acheron was the River of Woe in the underworld, which the dead had to cross — in some traditions it was Charon's river rather than the Styx.
Underworld
🏛 placeRealm of the dead
The Underworld was the vast subterranean realm where all mortal souls went after death — a geography of rivers, fields, and judges more detailed than any other mythological afterlife.
Hades
🏛 placeUnderworld geography
The vast underground kingdom of the dead ruled by the god Hades and his queen Persephone
Kokytos
🐉 creatureunderworld,rivers
One of the five rivers of the underworld, whose name means "the river of wailing" — the waters of lamentation that the unburied dead wandered beside for one hundred years.
Cephissus River
🏛 placeSacred geography
A river in Boeotia and Attica sacred to multiple deities and personified as a river-god
Xanthus River
🏛 placegeography
The principal river of Lycia in Anatolia, where the Lycian hero Sarpedon's homeland was located.
Eridanus
🏛 placeSacred geography
A mythological river associated with the fall of Phaethon and later identified with the constellation and the Po River
Scamander
⚡ godriver, Troy
River god of the Scamander, the great river of the Trojan plain.
Lerna
🏛 placeSwamp of the Hydra
Lerna was a marshy region near Argos, famed as the lair of the Lernaean Hydra and believed to contain one of the entrances to the underworld.
Cocytus
💭 conceptUnderworld
The river of lamentation in the Greek underworld, fed by the tears of the damned.