Breeds coasts from Greenland, Iceland, and northwestern Europe eastward to northwestern Siberian islands, also Canadian high Arctic to Newfoundland (eastern Canada); winters mainly North Atlantic coastal waters southward to Virginia, mid-Atlantic Ridge to Azores, and North Sea.
pollicaris
pollicaris (Pacific)
Breeds coasts from northeastern Siberian islands to Kamchatka, Kuril, and Commander islands (eastern Russia), also Aleutian and Bering Sea islands, and western and southwestern Alaska mainland; winters to coasts and coastal waters off Japan, Korean Peninsula, and southeastern Alaska southward to southern California (western USA).
