In Norse mythology

Norse mythology

Norse mythology, a subset of Germanic mythology, is the overall term for the myths, legends and beliefs about supernatural beings of Norse pagans. It flourished prior to the Christianization of Scandinavia, during the Early Middle Ages, and passed into Nordic folklore, with some aspects surviving...

, Amsvartnir (Old Norse

Old Norse

Old Norse is a North Germanic language that was spoken by inhabitants of Scandinavia and inhabitants of their overseas settlements during the Viking Age, until about 1300....

 "pitch black") is a lake. Amsvartnir contains the island Lyngvi, where the gods bound the wolf Fenrir. The lake is solely attested in the Prose Edda

Prose Edda

The Prose Edda, also known as the Younger Edda, Snorri's Edda or simply Edda, is an Icelandic collection of four sections interspersed with excerpts from earlier skaldic and Eddic poetry containing tales from Nordic mythology...

book Gylfaginning

Gylfaginning

Gylfaginning, or the Tricking of Gylfi , is the first part of Snorri Sturluson's Prose Edda after Prologue. The Gylfaginning deals with the creation and destruction of the world of the Norse gods, and many other aspects of Norse mythology...

, written in the 13th century by Snorri Sturluson

Snorri Sturluson

Snorri Sturluson was an Icelandic historian, poet, and politician. He was twice elected lawspeaker at the Icelandic parliament, the Althing...

. In the book, the enthroned figure of High

High, Just-As-High, and Third

High, Just-As-High, and Third are three men that respond to questions posed by Gangleri in the Prose Edda book Gylfaginning...

 tells Gangleri

Gangleri

Gangleri may refer to:* one of Odin's many nicknames meaning "the wanderer" or "Wayweary"* the name of the ancient Swedish king Gylfi, given while in disguise, as described in the book Gylfaginning collected in the Prose Edda...

 (king Gylfi

Gylfi

In Norse mythology, Gylfi, Gylfe, Gylvi, or Gylve was the earliest king in Scandinavia recorded. The traditions on Gylfi deal with how he was tricked by the gods and his relations with the goddess Gefjon.-The creation of Zealand:...

 in disguise) that the gods and Fenrir fared across Amsvartnir to get to Lyngvi, and there bound Fenrir.

Since Amsvartnir is only mentioned in Gylfaginning, Rudolf Simek

Rudolf Simek

Rudolf Simek is an Austrian Germanist and Philologian.Simek studied German literature, philosophy and Catholic theology in the University of Vienna, before becoming a librarian and a docent at the institution. He taught among others in the universities of Edinburgh, Tromsø and Sydney...

theorizes that Snorri invented the lake.