In Norse cosmology, the Élivágar (Old Norse 'stormy waves, icy waves') are primordial, venomous rivers. Remote in time and place, these rivers play a crucial role in Norse cosmogony: they produced the proto-being Ymir, who in turn bore the ancestors of many beings that populate the narratives that together form Norse mythology. In time, Ymir's body was dissected by a trio of gods to create the world as we know it, a sort of North Germanic myth of succession.

Borrowed into modern German, Élivágar readily becomes Eliwagar, a name under which Runahild, a musician from Lorraine, France (a city bordering Germany, Belgium, and Luxembourg), has released nine albums of what she calls "Hyperborean Heathen Folk". Today Runahild lives in Norway.