Lethe
An underworld water of forgetting; Plato’s Republic places forgetfulness after drinking in the Myth of Er.

Overview
Lethe is an underworld place or water associated with forgetting, treated here through Plato’s Myth of Er in Republic Book 10. Near the end of the soul’s afterlife journey, the plain of Lethe and the drinking of its water mark a threshold between what has been seen, what must be forgotten and the movement toward another life. This makes Lethe a boundary of memory rather than merely another river name. The account is bounded to the Platonic version and does not merge every Greek underworld river into one geography.
Key facts
Water of forgetting
Republic Book 10 says souls forget what they have seen after drinking the associated water.
Threshold in the Myth of Er
Lethe stands near the turn by which souls move toward another life in the Myth of Er.
Relationships
- Underworldbelongs to afterlife geography
Plato's Republic places Lethe within the afterlife landscape of the Myth of Er.
Ancient sources
MythWeave distinguishes ancient-source evidence from later adaptations and modern interpretation.