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.
In Greek mythology, Scylla (/ˈsɪlə/ SIL-ə; Ancient Greek: Σκύλλα, romanized: Skýlla, pronounced [skýlːa]) is a legendary, man-eating monster that lives on one side of a narrow channel of water, opposite her counterpart, the sea-swallowing monster Charybdis. The two sides of the strait are within an arrow's range of each other—so close that sailors attempting to avoid the whirlpools of Charybdis would pass dangerously close to Scylla and vice versa.
Scylla is first attested in Homer's Odyssey, where Odysseus and his crew encounter her and Charybdis on their travels. Later myth provides an origin story as a beautiful nymph who is transformed into a monster.
The Strait of Messina is a narrow strait between the eastern tip of Sicily (Punta del Faro) and the western tip of Calabria (Punta Pezzo) in Southern Italy. It connects the Tyrrhenian Sea to the north with the Ionian Sea to the south, within the central Mediterranean. At its narrowest point, between Torre Faro and Villa San Giovanni, it is 3.1 km (1.9 mi) wide. At the city of Messina, it is 5.1 km (3.2 mi) wide. The strait's maximum depth is about 250 m (820 ft).
The strait has strong tidal currents that create a unique marine ecosystem. The rock in the town of Scilla, Calabria at the north of the strait and a natural whirlpool in the northern portion of the strait have been linked to the Greek legend of Scylla and Charybdis. In some circumstances, the mirage of Fata Morgana can be observed when looking at Sicily from Calabria. With its bottleneck shape, it is also a compulsory point of transit in the migration of many bird species.
Being "between Scylla and Charybdis" (/bi.ˈtwiːn ˈsɪ.lə ænd kə.ˈrɪb.dɪs/ also /bə-, bɪ-/) is an idiom deriving from Greek mythology, which has been associated with the proverbial advice "to choose the lesser of two evils". Several other idioms such as "on the horns of a dilemma", "between the devil and the deep blue sea", and "between a rock and a hard place" express similar meanings. The mythical situation also developed a proverbial use in which seeking to choose between equally dangerous extremes is seen as leading inevitably to disaster.