Lethe

Λήθη
The Afterlife. Entering Underealm feels like awakening and lifting out of a flowing river of forgetfulness and unmindfulness.

Spoilers
Warning, Major Series Spoilers ensue... Peruse at your own risk: ====== A New Kharon Series ====== n/a

Real World Influence
Wikipedia:Lethe In Greek mythology, Lethe was one of the five rivers of the underworld of Hades. Also known as the Ameles potamos (river of unmindfulness), the Lethe flowed around the cave of Hypnos and through the Underworld where all those who drank from it experienced complete forgetfulness. In Classical Greek, the word lethe literally means "oblivion", "forgetfulness", or "concealment".