According to a myth of Kuni-umi in Kojiki, Kumaso was told as one of the four areas of Tsukushi no shima Island (Kyushu), which was born after Shikoku and before Iki Island, and its another name was said to be 'Takehiwake.'
古事記・国産み神話においては、四国の次、壱岐の前に生まれた筑紫島（九州）の四面のひとつとして語られ、別名を「建日別（タケヒワケ）」といったとされる。