Individual #River_Cocytus__Cocytus  (Greek mythology) a river in Hades that was said to be a tributary of the Acheron
  instance of:  river
  part of:  Hel__Hell__Hades__infernal_region__netherworld__Scheol__underworld  (in various religions) the world of the dead; "he didn't want to go to hell when he died"

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