The Ameles potamos flowed through the Underworld around the cave of Hypnos. Lethe was, is mentioned also in the first part of the Comedy in the Inferno. A few mystery religions taught the existence of another river, the Mnemosyne. These two rivers are attested on gold plates in several verse inscriptions. The river is referenced also in poetry and more recent novels. Alaska is located in Southwest Alaska within Preserve and the Katmai National Park. The River Lethe flowed in Hades through the plain of Lethe.
Poets used often Lethe for the underworld as a metaphor.