Hi,

As one of the major realms in the Norse cosmology, Midgard belonged to a complex religious, mythological and cosmological belief system shared by the Scandinavian and Germanic peoples. This mythological tradition developed in the period from the first manifestations of religious and material culture in approximately 1000 B.C.E. until the Christianization of the area, a process that occurred primarily from 900-1200 C.E.
Within this framework, Norse cosmology postulates a universe divided into nine interrelated realms, some of which attracted considerably greater mythological attention. Of primary importance was the threefold separation of the universe into the realms of the gods (Asgard and Vanaheim, homes of the Aesir and Vanir, respectively), the realm of mortals (Midgard) and the frigid underworld (Niflheim), the realm of the dead. These three realms were supported by an enormous tree (Yggdrasil), with the realm of the gods ensconced among the upper branches, the realm of mortals approximately halfway up the tree (and surrounded by an impassable sea), and the underworld nestled among its roots. The other realms included Alfheim, world of the elves; Svartálfheim, home of the dark elves; Nidavellir, world of the dwarves (tiny men who were incomparable miners and goldsmiths), Jotunheim, world of the Jotun (giants), and Muspelheim, the hellish fire-realm that was home to Surt, a flame giant who would fight against the Aesir at Ragnarök.

Thanks