Charybdis

Charybdis (/kəˈrɪbdɪs/; Ancient Greek: Χάρυβδις, romanized: Khárybdis, Attic Greek: [kʰárybdis]; Latin: Charybdis, Classical Latin: [kʰäˈrʏbd̪ɪs̠]) is a sea monster in Greek mythology. Charybdis, along with the sea monster Scylla, appears as a challenge to epic characters such as Odysseus, Jason, and Aeneas. Scholarship locates her in the Strait of Messina.

The idiom "between Scylla and Charybdis" has come to mean being forced to choose between two similarly dangerous situations.