 The administrative center of the oblast, Yuzhno-Sakhalinsk, a city of about 175,000, has a large Korean minority, typically referred to as Sakhalin Koreans, who were forcibly brought by the Japanese during World War II to work in the coal mines.Most of the population lives in the southern half of the island, centered mainly around Yuzhno-Sakhalinsk and two ports, Kholmsk and Korsakov (population about 40,000 each).The 400,000 Japanese inhabitants of Sakhalin (including the Japanized indigenous Ainu) who had not already been evacuated during the war were deported following the invasion of the southern portion of the island by the Soviet Union in 1945 at the end of World War II.