They lived in Svartalfheim, the Land of the Dark Elves, in the north of Midgard, and below Nidavellir (Dark Home), where the dwarves lived.
According to Kevin Crossley-Holland[?], "No valid distinction though can be drawn between the dwarfs and the dark elves; they appear to have been interchangeable."
... is that it is usually immensely longer, and for many planets a beanstalk cannot be constructed from known materials. An Earth beanstalk would be near the limit ...
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