Square Kofun (方墳, Hōfun) are a kind of Kofun that has only a square mound. They are usually smaller than the kofun shapes.^[1] ^[2]

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Tsude Hiroshi [ja] argues that there is a hierarchy of Zenpō-kōen-fun > Zenpō-kōhō-fun > Round Kofun > Square Kofun that he calls the Kofun system [en; ja].^[2]

References