Its largest areas are located in Russia and Canada. In North America, it includes most of inland Canada, Alaska, and parts of the northern contiguous United States. In Eurasia, it includes most of Sweden, Finland, much of Russia-from Karelia in the west to the Pacific Ocean (including much of Siberia), much of Norway and Estonia, parts of the Scottish highlands, some coastal areas of Iceland, and areas of northern Kazakhstan, northern Mongolia, and northern Japan (on the island of Hokkaido).
