UNDERGROUND RIVER Crossword Clue
UNDERGROUND RIVER Crossword Clue
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                    Crossword Puzzle Infos
                            
                                The term 'Underground River' refers to a river or stream that flows beneath the surface of the Earth. The most famous example is the Styx, which is a river in Greek mythology that formed the boundary between the Earth and the Underworld. It was also said to be a river of hatred and was guarded by the three-headed dog Cerberus.