Cocytus, meaning "the river of wailing" (from the Greek κωκυτός, "lamentation"), is a river in the unerworld in Greek mythology. Cocytus flowed into the river Acheron, across which dwelled Hades, the mythological abode of the dead. There are five rivers encircling Hades. The River Styx is perhaps the most famous; the other rivers are Phlegethon, Lethe, and Acheron.