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In ancient Norse mythology and cosmology, Yggdrasil is an immense tree that sprang forth in the primordial void of Ginnungagap, unifying the 9 worlds of Asgard, Álfheimr/Ljósálfheimr, Niðavellir/Svartálfaheimr, Midgard (Earth), Jötunheimr/Útgarðr, Vanaheim, Niflheim, Muspelheim & Hel.