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The principal river in the Greek underworld (also called Hades). The river forms a border between the underworld and the world of the living. 

The word means HATE in Greek and is named after the goddess, Styx.   The other major rivers include the Acheron (river of pain), the Lethe (river of forgetfulness), the Phlegethon (river of fire), and the Cocytus (river of wailing).