Bifröst (Earth-5911)

The Bifröst is a mystical lake within the board of Ásgarðr that connects the Realm-Eternal with all the other Nine Worlds of Yggdrasill. It is forever watched by Heimdallr, who guards it with his all-seeing vision and his Gjallarhorn.

History
The Bifröst was created by Óðinn to connect his home of Ásgarðr to the other eight creations. However, to ensure its safety, Óðinn placed his nephew Heimdallr, who possessed the godly power of observing all souls in the universe, to serve as the lake's gatekeeper.