 In chapter 17 , High tells Gangleri that the location of Himinbjörg " stands at the edge of heaven where Bifrost reaches heaven . " While describing the god Heimdallr in chapter 27 , High says that Heimdallr lives in Himinbjörg by Bifröst , and guards the bridge from mountain jotnar while sitting at the edge of heaven . In chapter 34 , High quotes the first of the two Grímnismál stanzas that mention the bridge . In chapter 51 , High foretells the events of Ragnarök . High says that , during Ragnarök , the sky will split open , and from the split will ride forth the " sons of Muspell " . When the " sons of Muspell " ride over Bifröst it will break , " as was said above . " 
