Final answer:
In Greek mythology, Phaethon fell into the river Eridanus after being struck by a lightning bolt.
Step-by-step explanation:
The mythological character Phaethon was struck by a lightning bolt and fell into the river Eridanus, according to Greek mythology. This river is associated with several myths and is often described as a cosmic or otherwordly river. For instance, in the work of Apollonius Rhodius, the Eridanus appears with connections to the tale of Phaethon. Moreover, Virgil's description of the river flowing from a forest smelling of laurels might also be part of his literary construction of the underworld's geography, drawing from different mythological concepts to create a vivid setting.