In Norse mythology, the river Iving separated Jotunheim and Asgard. According to the myths, the river will never freeze over, regardless of how cold it becomes, and will continue to flow until the end of time. Norse mythology, Viking mythology or Scandinavian mythology refer to the pre-Christian religion, beliefs and legends of the Scandinavian people, including those who settled on Iceland, where the written sources for Norse mythology were assembled. ... For the Second World War frigate class, see River class frigate The Murray River in Australia A river is a large natural waterway. ... Jotunheim is the world of the giants (two types: rock and frost, collectively called Jotuns) in the Norse Mythology. ... Asgard (Old Norse: Ásgarðr) is the realm of the gods, the Æsir, in Norse mythology, thought to be separate from the realm of the mortals, Midgard. ...