Midgard is a term from Norse mythology that refers to the world inhabited by humans. The name "Midgard" means "middle enclosure" or "middle earth" and refers to the idea that Midgard is situated halfway between Niflheim, the land of ice, and Muspelheim, the region of fire. According to legend, Midgard was created from the body of the giant Aurgelmir (Ymir) . Aurgelmirs flesh became the land, his blood the oceans, his bones the mountains, his teeth the cliffs, his hair the trees, and his brains became the clouds. Midgard is surrounded by the uninhabited wilderness of Jotunheim, the world of giants, and is joined with Asgard, the abode of the deities, by Bifrost, the rainbow bridge. Midgard will be destroyed at Ragnarök, the battle at the end of the world, and almost all life on it will be destroyed, with the earth sinking into the sea only to rise again, fertile and green when the cycle repeats and the creation begins again.