The language diverged into West Norse (Norway, Faroe Islands, Iceland, and Greenland) and East Norse (Denmark and Sweden). With some minor regional variations in loan words, both West Norse and East Norse are essentially the same. The Vikings who raided and later settled in Great Britain came mainly from Norway and Denmark.
Note: this list is incomplete. Some of these words (such as "Ragnarök") are much later borrowings used to discuss Old Norse concepts.
ado: influenced by Norse "at" ("to", infinitive marker) which was used with English "do" in certain English dialects