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The Sea of Okhotsk has long been the southernmost spot in the Northern Hemisphere where polar sea ice is found. After spreading southward out of the Arctic each winter and along the eastern edge of Sakhalin Island, the ice typically arrives in Hokkaido in mid to late January. The best time to see it is the latter half of February but it stays until late March or early April. However, over the past twenty years the drift ice has been slowly diminishing. Some say this is the result of global warming. The people of Abashiri have come together to take action.