
Tuonela is the realm of the dead or the Underworld in Finnish and Estonian mythology. Tuonela, Tuoni, Manala and Mana are used synonymously. In Estonian mythology, it is called Toonela or Manala. Tuonela is best known for its appearance in the Finnish national epic Kalevala. In the 16th song of Kalevala, Väinämöinen, a shamanistic hero, travels...
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http://en.wikipedia.org/wiki/Tuonela

In Finnish mythology, Tuonela was the underworld, a place tenanted by diseases and corpse-eating monsters in which every concept of the upper world was reversed.
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http://www.probertencyclopaedia.com/browse/DCT.HTM

the afterworld, an island on which the sun and moon never shine. Also called
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https://www.infoplease.com/dictionary/tuonela
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