Styx
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.
The Story of Styx
Styx was both a river and a goddess — an Oceanid who sided with Zeus in the Titanomachy. Zeus honoured her by making her river the binding medium of divine oaths. Any god who swore by the Styx and broke the oath was stripped of speech and breath for nine years. Thetis dipped Achilles in the Styx to make him invulnerable — his heel, where she held him, remained mortal. The river formed the boundary between the world of the living and the dead. Charon's ferry crossed its waters.
Parents
Oceanus and Tethys
Symbols
Fun Fact
"Stygian" — meaning dark, gloomy, or infernal — comes from this river. It's one of the most evocative adjectives in English.
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
🏛 placeThe river of the underworld
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.
Styx
🌿 nymphOceanid goddess of the oath-river
Styx was both a river and an Oceanid goddess — the first divine ally of Zeus in the Titanomachy, rewarded by having her waters become the gods' unbreakable oath.
Cephissus River
🏛 placeSacred geography
A river in Boeotia and Attica sacred to multiple deities and personified as a river-god
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.
Horkos
⚡ godOaths, the binding power of sworn promises
The daimon who punished oath-breakers, making the sworn word a sacred and dangerous act
Alpheus River
🏛 placegeography
The longest river in the Peloponnese, personified as a god who pursued the nymph Arethusa beneath the sea.
Scamander
⚡ godriver, Troy
River god of the Scamander, the great river of the Trojan plain.
Xanthus River
🏛 placegeography
The principal river of Lycia in Anatolia, where the Lycian hero Sarpedon's homeland was located.
Peneus
⚡ godriver, Thessaly
River god of the Peneus in Thessaly, father of Daphne.
Asopus River
🏛 placegeography
A Boeotian river personified as a god whose daughters were repeatedly abducted by Olympian gods.
Cephissus
⚡ godriver, purification
River god of the Cephissus, the principal river of Attica and Boeotia.