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This spring flows from the river Lethe. The River of Forgetfulness. One drop of its waters, and it will be as if Zelena never even met Hades.
Cora to Regina src

The Lethe, also known as the River of Forgetfulness, is an Underworld location on ABC's Once Upon a Time. It first appears in the twelfth episode of the fifth season.

The Lethe is based on the river of the same name from Greek Mythology.


History

Before First Curse

The Lethe is one of the five rivers in Hades' Lair in the Underworld. A spring from the Lethe also runs near Cora's manor in the Enchanted Forest. One day, Cora brings Regina's half-sister Zelena to the manor to heal Regina. The girls bond and are delighted when they discover that they are sisters. Although they desire to stay together, Cora drags Zelena back to Oz and uses water from the Lethe to make them forget they ever met. ("Sisters")

After Third Curse

In the Underworld decades later, in a plan with Regina to erase Hades from Zelena's mind, Cora shows up at Zelena's farmhouse to reconcile with her, while Regina sneaks in from the back. Cora gets a glass of water for her, that Regina put water from the Lethe in. Zelena figures out what Cora and Regina are up to, but when she picks a fight with Regina, Cora restores the sisters' lost memories of each other. ("Sisters")

Appearances

References

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