Boundaries between the continents of Earth Zemlya extend northward from the northern end of the Ural Mountains and are a continuation of that chain into the Arctic Ocean. While Novaya Zemlya was variously grouped with Europe or with Asia in 19th-century maps it is now usually grouped with Europe, the continental boundary considered to join the Arctic Ocean along the southern shore of the Kara Sea. The Russian Arctic archipelago of Franz Josef Land farther north is also associated with Europe. Europe ends in the west at the Atlantic Ocean, although Iceland and the Azores archipelago (in the Atlantic, between Europe and North America) are usually
Arctic lemming Arctic lemming The Arctic lemming ("Dicrostonyx torquatus") is a species of rodents in the family Cricetidae. Although generally classified as a "least concern" species, the Novaya Zemlya subspecies "(Dicrostonyx torquatus ungulatus)" is considered a vulnerable species under Russian nature conservation legislation (included in Red Book of Russian Federation since 1998). It is found only in the Arctic biomes in the Russian Federation, and it is the commonest mammal on Severnaya Zemlya. Specimens were once found in England, but they are now extirpated. For the most part, lemmings of the genus "Lemmus" can coexist with those of genus "Dicrostonyx". Arctic lemmings