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Prefecture
The flag of Okinawa Prefecture is a white field charged in the center with the prefectural emblem, which consists of three circles stacked on top of each other. The two inner circles are positioned upwards; the outermost and innermost circles are red and the middle circle is white. The emblem was adopted on May 15, 1972, when the United States ended its administration of the Ryukyu Islands and returned Okinawa Prefecture to Japan. The flag was adopted shortly afterward on October 13, 1972.