Midgard (Old Norse: Miðgarðr meaning "middle enclosure") is one of the Nine Realms of Norse mythology. It is the realm of humans (mortals) and is the only realm fully visible to mankind, though other realms intersect with it.
Midgard is bordered by Niflheim to the north and Muspelheim to the south. It is surrounded by an ocean inhabited by the world-encircling Jörmungandr, often referred to as "Miðgarðsormr" or the "Midgard serpent". It is also connected to Asgard, the realm of the Æsir, by the Bifröst.
The world of Midgard is destined to be destroyed during Ragnarök; the end of the world. Jörmungandr will arise from the ocean and poison the land with his venom. Opposing forces of Æsir, Vanir and other allies will fight Loki and the Jötunn, amongst other forces, at Vígríðr. Resulting casualties will include many of the gods and their enemies (Jörmungandr and Thor will be slain by each other). The world will then be engulfed in the flames of Surtr and sink into the sea, only to rise anew.