In Norse mythology, Gálgviðr (Old Norse "gallows-wood") is a forest in Jotunheim, land of the jötnar, from which the rooster Fjalar is foretold to begin crowing during the onset of Ragnarok.
According to stanza 42 of the poem Völuspá from the Poetic Edda:
References
Gálgviðr Wikipedia(Text) CC BY-SA