Midgard.
To modern humans, such a place was nothing but a myth, an imagination. A concept written down by their own kind.
While to those who still believed in the norse gods, and norse mythology.
Midgard was the Middle Earth, the abode of mankind, made from the body of the first created being, the giant Aurgelmir, or Ymir.
According to their legend, the gods killed Aurgelmir, rolled his body into the central void of the universe, and began fashioning the world of mankind, Midgard.
Aurgelmir's flesh became the land, his blood the oceans, his bones the mountains, his teeth the cliffs, his hair the trees, and his brains, blown over the earth, became the clouds.
Aurgelmir's skull was then held up by four dwarfs, Nordri, Sudri, Austri, and Vestri, the four points of the compass, and became the dome of the heavens. While the sun, moon, and stars were made of scattered sparks that were caught in the skull.