In Norse mythology, Gjöll is the river that flows from Hvergelmir and is linked with the route to the realm of the dead.
Hvergelmir is a primordial spring associated with Niflheim and with the origins of many rivers. Gjöll is counted among the mythic waterways connected to that source. In another famous passage, the dead cross Gjöll by means of Gjallarbrú during the journey toward Hel.
The name can be confused with several other river names in Norse mythology, including Slídr and Leipt. It is also easy to confuse Gjöll with Gjallarbrú, but the latter is the bridge spanning the river. These names come from different episodes that medieval authors preserved together in mythological texts.
Norse cosmology does not function like a modern geographic atlas, and the surviving sources sometimes give overlapping or variant descriptions. Gjöll’s connection with Hvergelmir and the dead-road is nevertheless a well-established literary detail.