Round Kofun (円墳, Enpun) are a kind of Kofun that has only a round mound and no square segment.^[1] There are many types of Kofun including Zenpō-kōen-fun and Zenpō-kōhō-fun and Round Kofun and Square Kofun.^[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]

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