Elfdalian or Övdalian is a North Germanic language spoken by about 3 – 5000 people in the Älvdalen Municipality in Northern Dalarna in central Sweden. Elfdalian is considered to be a separate language by some linguists, but many others believe it to be a dialect of Swedish. It has developed in relative isolation since the Middle Ages and maintains a number of features of Old Norse not found in other Northern Germanic languages, not even in Icelandic. As a result, Elfdalian differs markedly from Swedish and can be difficult for other Swedes to understand. [...] The dialectal position of Elfdalian within the Scandinavian continuum lies in the middle between East and West Nordic. Certain linguistic features indicate the language split from its Norse neighbours in the early Old Norse period; perhaps around the 8th century.