Jötunheim was found and named by Bergelmir and his wife, the only Jötnar survivors of Odin's slaughter of their forefather, Ymir. Since then, it has become the sanctuary of the Frost Giants, a home where they could grow and prosper as well as the place where their would-be murderers, the Aesir, couldn't reach them.
The guardian of the gates of Jötunheim is Duraþrór the Stag, a statue of him keeping the entrance of the Heart of the Mountain in Midgard, where at its peak is the only gate to the Giants Realm left behind after the Jötnar successfully escaped the Middle Realm.
Jötunheim's landscape consists of large mountains so high that their peaks reach above the clouds. The only indoor structure seen so far is a large room built inside a hand-shaped mountain, the highest peak in the Nine Realms. The room is adorned with statues and carvings of Giants, written prophecies in its walls and a mural depicting the story of "Loki."
After the withdrawal of all the Giants who had remained in Midgard, Jötunheim became the tomb of the Jötnar race, their corpses laid around the mountains while they wait for the return of their guardian.
When Kratos and Atreus finally reached Jötunheim to spread Laufey's ashes, their guardian at last could reunite with her people. It was also when Laufey's son, Atreus, discovered his heritage, realizing that both he and the World Serpent were the last living Jötnar in the Nine Realms.
- In the God of War (series), Jötunheim has subtle similarities to Tartarus, as they both depict the fall of Jötnar and Titans, respectively. Both Jötnar and Titans were enemies of the Gods of their world. The main difference is Jötunheim was a home for the Jötnar, and Tartarus was a prison for the Titans.
- It's only possible to visit Jötunheim in the main quest.
- However, Kratos is given a brief vision of Faye standing on the bridge to the Jötunheim mountain while he is inside the Light of Alfheim, early in the main quest.
- It is unknown how or why the remaining Jötnar in Jötunheim died out, despite sealing the entrance to their realm. However, it is implied by Jörmungandr's Jötunn Shrine that there are still other Jötnar alive, given that Loki is prophesied to marry Angrboða, who is a Jötunn herself. It is unclear if Jörmungandr being sent to the past by the Mjölnir affected the prophecy and somehow caused the demise of all the Jötnar in Jötunheim. Alternatively, some Jötnar could have been hiding somewhere else and survived.
- The ending of the game is shown in a giant mural similar to the ones found in Jötunheim, after Kratos knocks the Baldur into a fight within an open area, it could have been left behind by Faye as a message to Kratos and Atreus, but was destroyed during said fight.
- The rune for Jotunhiem is Eihwaz, which can represent a yew tree.