The Mainland Japan reference article from the English Wikipedia on 24-Jul-2004
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Mainland Japan

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Mainland Japan is an uncommon term to distinguish the area of Japan from Okinawa and Hokkaido and the colonies that Japan used to possess in East Asia. It is somewhat confusing as Mainland Japan is defined to consist of several major islands (Honshu, Kyushu, Shikoku) and many minor ones. The term is also sometimes used to refer just to Honshu, the largest island.

See also: Mainland