 In the Poetic Edda , the bridge is mentioned in the poems Grímnismál and Fáfnismál , where it is referred to as Bilröst . In one of two stanzas in the poem Grímnismál that mentions the bridge , Grímnir ( the god Odin in disguise ) provides the young Agnarr with cosmological knowledge , including that Bilröst is the best of bridges . Later in Grímnismál , Grímnir notes that Asbrú " burns all with flames " and that , every day , the god Thor wades through the waters of Körmt and Örmt and the two Kerlaugar : 
