Native to:
Afghanistan,
Alaska,
Albania,
Alberta,
Aleutian Is.,
Altay,
Amur,
Argentina South,
Assam,
Austria,
British Columbia,
Bulgaria,
Buryatiya,
California,
Central European Rus,
Chile South,
China North-Central,
China South-Central,
China Southeast,
Chita,
Colorado,
Corse,
East European Russia,
East Himalaya,
Finland,
France,
Føroyar,
Great Britain,
Greece,
Greenland,
Iceland,
Idaho,
India,
Inner Mongolia,
Iran,
Irkutsk,
Italy,
Japan,
Jawa,
Kamchatka,
Kazakhstan,
Khabarovsk,
Kirgizstan,
Korea,
Krasnoyarsk,
Kuril Is.,
Labrador,
Magadan,
Malaya,
Manchuria,
Manitoba,
Mongolia,
Montana,
Myanmar,
Nepal,
Nevada,
North Caucasus,
North European Russi,
Northwest European R,
Northwest Territorie,
Norway,
Nunavut,
Ontario,
Oregon,
Pakistan,
Primorye,
Qinghai,
Québec,
Romania,
Sakhalin,
Spain,
Sri Lanka,
Sumatera,
Svalbard,
Sweden,
Switzerland,
Tadzhikistan,
Taiwan,
Thailand,
Tibet,
Transcaucasus,
Turkey,
Tuva,
Ukraine,
Utah,
Uzbekistan,
Vietnam,
Washington,
West Himalaya,
West Siberia,
Wyoming,
Xinjiang,
Yakutskiya,
Yugoslavia,
Yukon
Introduced into:
Belgium,
Czechoslovakia,
Denmark,
Germany,
Ireland,
Massachusetts,
Mexico Gulf,
Netherlands,
Newfoundland,
Poland