In Norse mythology, Gjallarbrú is the bridge leading toward the realm of the dead.
Hermóðr crosses Gjallarbrú during his journey to Hel to ask for Baldr’s release. The bridge spans the river Gjöll and is guarded by the giantess Móðguðr, who questions Hermóðr about his identity and destination. This episode appears in Snorri Sturluson’s account of Baldr’s death and the attempt to bring him back.
Gjallarbrú is distinct from Bifröst, the rainbow bridge connecting Asgard with the world of humans. Both bridges are important in Norse mythology, but they serve different journeys and locations. Gjallarbrú is associated with the passage toward Hel, while Bifröst provides access between the gods’ realm and Midgard.
The name is sometimes translated as “Gjöll Bridge.” English spellings vary because Old Norse letters and accents are represented differently across editions.