Sæmundr Sigfússon, The Elder Edda of Saemund Sigfusson and the Younger Edda of Snorre Sturleson… (1907)
“ When the gods saw that the wolf was effectually bound, they took the chain called Gelgja, which was fixed to the fetter, and drew it through the middle of a large rock named Gjoll, which they sank very deep into the earth; afterwards, to make it still more secure, they fastened the end of the cord to a massive stone called Thviti, which they sank still deeper. The wolf made in vain the most violent efforts to break loose, and opening his tremendous jaws endeavoured to bite them. ”
