Glæsisvellir (glittering plains) was a location in Jotunheim in Norse mythology. It is mentioned in sources, such as Bósa saga ok Herrauds and Hervarar saga.In the Glæsisvellir could be found a location called Odinsaker, or Údáinsakr "Deathless Acre", and everyone who went there became healthy and young, and so no one ever died in Odinsaker. The Eireks saga víðförla is about a man who searched for and found Údáinsakr.In Gesta Danorum, Saxo Grammaticus makes a reference to Odinsaker as the place where the Scanian governor Fialler retired after having been attacked by the Danish king Wiglek: In the Hervarar saga, it is the kingdom of Gudmund and his son Höfund. Gudmund was a friendly giant who was popular in later sagas.
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