
In Greek mythology, the river Phlegethon (Φλεγέθων, English translation: `flaming`) or Pyriphlegethon (Πυριφλεγέθων, English translation: `fire-flaming`) was one of the five rivers in the infernal regions of the underworld, along with the rivers Styx, Lethe, Cocytus, and Acheron. Plato describes it as `a stream of fire, wh...
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http://en.wikipedia.org/wiki/Phlegethon

• (n.) One of the principal rivers of Hades, in the channel of which fire flowed instead of water.
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http://thinkexist.com/dictionary/meaning/phlegethon/

the underworld River of Flame.
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http://www.chalquist.com/writings/greekmyth/

In Greek mythology, a river of fire encircling the underworld, or Hades, and emptying into Lake Acheron. ...
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http://www.encyclo.co.uk/local/20688
Phleg'e·thon noun [ Latin , from Greek ..., propast participle pr. of ... to blaze.]
(Class Myth.) One of the principal rivers of Hades, in the channel of which fire flowed instead of water. « Fierce
Phlegethon , Whose waves of torrent fire inflame with rage.»
Milto...Found on
http://www.encyclo.co.uk/webster/P/73

Phlegethon Name of a fabled river of fire, one of the five rivers of Hades.
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http://www.wordinfo.info/words/index/info/view_unit/1642/

One of several Rivers of Underworld.
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https://www.infoplease.com/arts-entertainment/mythology/greek-and-roman-myt
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