Beyond the wall, beyond the roaring rivers, lies Jötunheim – the land of the giants. It is the world of the untamed: frost and rock, ancient forces older than the gods themselves. And yet the border is more porous than it seems, for the Æsir fetch their brides from there.
The Jötnar (singular jötunn) are no dull colossi, whatever the word ‘giant’ suggests. They are embodiments of nature's powers – frost-giants, mountain-giants, sea-giants – and often older and wiser than the gods. From them comes the knowledge of the world's beginning and end.
Jötunheim (also Útgarðr, ‘that which lies outside the fence’) is divided from Midgard by rivers – the Élivágar, the ice-waves, and the river Ífing, which never freezes. Here Thor journeys again and again to slay giants; here Odin comes to learn. And from here come divine consorts, giantesses taken into Asgard.
“Ífing the river is named that flows / between the earth and the giants; / open shall it run through all the ages, / no ice on the stream shall be.”Vafþrúðnismál 16, translation after Henry Adams Bellows (public domain)
Thor · Midgard · Muspelheim – the fire world · Ragnarök · The Nine Worlds.
Snorri Sturluson, Gylfaginning (c. 1220). Vafþrúðnismál, Skírnismál, Þrymskviða (Poetic Edda), English public domain: Henry Adams Bellows (1923). Scholarship: Rudolf Simek, Dictionary of Northern Mythology; John Lindow, Norse Mythology.