Related Clues:

• Place for pigs by river
• Water underground comes from toilet here
• It runs in the underworld
• Flower of darkness adheres to the ear
• River that didn't touch Achilles' heel
• 'Boat on the River' band, aptly
• In Greek mythology, the river forming the border between Earth and the underworld
• Mythological river around the underworld
• The river between Earth and the underworld in Greek mythology
• Achilles was dipped in it
• River into which the infant Achilles was dipped
• River on which Greek deities swore their oaths
• River gets clogged up in sound
• River that made Achilles (mostly) invincible
• River in Greek myth