"In Norse mythology, the yawning chasm that existed at the beginning of the universe. The ‘Voluspa', a poem in the ‘Poetic (or Elder) Edda' whose name means “Sybil's Prophecy,” describes a land “at the beginning of time, when nothing was; sand was not, nor sea, nor cool waves. Earth did not exist, nor heaven on high. The mighty gap was, but no growth.” This was Ginnungagap.

Ginnungagap was not featureless or devoid of topography. Within it, to the north, lay Niflheim, a grim, mist-filled, icy wasteland. In the center of Niflheim the great spring Hvergelmir, the source of all rivers, churned and bubbled. The northernmost part of Niflheim was frozen solid. Its immense mountains of ice had been formed from Elivagar (or Élivágar, which means “icy waves”), a primordial river so ancient that its origins could never be known.

Some type of a poisonous flow had accompanied these waters from their indeterminable source. When the water had turned to ice, the vapor rising from the poison froze on top of it and turned to rime, and increased, layer upon layer. The northern part of Ginnungagap became filled with the weight and heaviness of ice and rime.

In the south of Ginnungagap lay Muspelheim, a region of fire, bright and hot, burning and impassible. A fire-giant, Surt, stood at the border of Muspelheim, ready to defend it, armed with a flaming sword.

Sparks and molten particles came flying out of Muspelheim up toward the center of Ginnungagap as the poisonous frost of Niflheim encroached from the north. Ginnungagap itself was as mild as a windless sky. Where the warmth met the ice and poisonous mist, the ice thawed and dripped, and the shape of a man formed. This was Ymir, whom the frost-giants called Aurgelmir (Mud Seether), and from him all the generations of frost giants descended. The next being to form was a great cow, Audhumia, who licked the ice and formed the progenitor of the gods, Buri. Buri's grandsons, the first gods, killed Ymir and brought his body to the center of Ginnungagap, and created heaven and Earth from it.

Niflheim and Muspelheim were not destroyed when Earth and heaven were created; they were realms that continued to exist in Norse cosmology. The Vikings believed that at the end of the world—Ragnarok—the fire-giant Surt would leave Muspelheim to engage in the battle and, with his flaming sword, would burn the whole world." Britannica Student Encyclopedia