Eurasian beavers (C. fiber) were once found throughout temperate and boreal forests of the region (including Britain) except for the Mediterranean area and Japan. By the early 20th century this range had contracted, and at the beginning of the 21st century indigenous populations survived only in the Elbe and Rhône river drainages, southern Norway, France, Mongolia, China, and parts of Russia, especially northwestern Siberia and the Altai region. Efforts to reestablish the Eurasian species began in Sweden in the early 1920s. Since that time, Eurasian beavers have been reintroduced throughout Europe, western Siberia, western China, Mongolia, the Kamchatka Peninsula, and near the Amur River in the Russian Far East
